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Annotation of 43BSD/contrib/rn/rn.1, revision 1.1

1.1     ! root        1: ''' $Header: rn.1,v 4.3.1.5 85/09/10 11:05:55 lwall Exp $
        !             2: ''' 
        !             3: ''' $Log:      rn.1,v $
        !             4: ''' Revision 4.3.1.5  85/09/10  11:05:55  lwall
        !             5: ''' Improved %m in in_char().
        !             6: ''' 
        !             7: ''' Revision 4.3.1.4  85/07/23  18:26:40  lwall
        !             8: ''' Added MAILCALL.
        !             9: ''' 
        !            10: ''' Revision 4.3.1.3  85/05/23  17:14:14  lwall
        !            11: ''' Now allows 'r' and 'f' on null articles.
        !            12: ''' 
        !            13: ''' Revision 4.3.1.2  85/05/13  09:27:53  lwall
        !            14: ''' Added CUSTOMLINES option.
        !            15: ''' 
        !            16: ''' Revision 4.3.1.1  85/05/10  11:38:22  lwall
        !            17: ''' Branch for patches.
        !            18: ''' 
        !            19: ''' Revision 4.3  85/05/01  11:48:26  lwall
        !            20: ''' Baseline for release with 4.3bsd.
        !            21: ''' 
        !            22: ''' 
        !            23: .de Sh
        !            24: .br
        !            25: .ne 5
        !            26: .PP
        !            27: \fB\\$1\fR
        !            28: .PP
        !            29: ..
        !            30: .de Sp
        !            31: .if t .sp .5v
        !            32: .if n .sp
        !            33: ..
        !            34: .de Ip
        !            35: .br
        !            36: .ie \\n.$>=3 .ne \\$3
        !            37: .el .ne 3
        !            38: .IP "\\$1" \\$2
        !            39: ..
        !            40: '''
        !            41: '''     Set up \*(-- to give an unbreakable dash;
        !            42: '''     string Tr holds user defined translation string.
        !            43: '''     Bell System Logo is used as a dummy character.
        !            44: '''
        !            45: .tr \(bs-|\(bv\*(Tr
        !            46: .ie n \{\
        !            47: .ds -- \(bs-
        !            48: .if (\n(.H=4u)&(1m=24u) .ds -- \(bs\h'-12u'\(bs\h'-12u'-\" diablo 10 pitch
        !            49: .if (\n(.H=4u)&(1m=20u) .ds -- \(bs\h'-12u'\(bs\h'-8u'-\" diablo 12 pitch
        !            50: .ds L" ""
        !            51: .ds R" ""
        !            52: .ds L' '
        !            53: .ds R' '
        !            54: 'br\}
        !            55: .el\{\
        !            56: .ds -- \(em\|
        !            57: .tr \*(Tr
        !            58: .ds L" ``
        !            59: .ds R" ''
        !            60: .ds L' `
        !            61: .ds R' '
        !            62: 'br\}
        !            63: .TH RN 1 LOCAL
        !            64: .SH NAME
        !            65: rn - new read news program
        !            66: .SH SYNOPSIS
        !            67: .B rn [options] [newsgroups]
        !            68: .SH DESCRIPTION
        !            69: .I Rn
        !            70: is a replacement for the readnews(1) program that was written to be as
        !            71: efficient as possible, particularly in human interaction.
        !            72: .I Rn
        !            73: attempts to minimize the amount of \*(L"dead\*(R" time spent reading
        !            74: news\*(--it tries to get things done while the user is reading or deciding
        !            75: whether to read, and attempts to get useful information onto the screen as
        !            76: soon as possible, highlighting spots that the eye makes frequent reference
        !            77: to, like subjects and previously read lines.
        !            78: Whether or not it's faster, it SEEMS faster.
        !            79: .PP
        !            80: If no newsgroups are specified, all the newsgroups which have unread news
        !            81: are displayed, and then the user is asked for each one whether he wants to
        !            82: read it, in the order in which the newsgroups occur in the
        !            83: .I .newsrc
        !            84: file.
        !            85: With a list of newsgroups,
        !            86: .I rn
        !            87: will start up in \*(L"add\*(R" mode, using the list as a set of patterns to
        !            88: add new newsgroups and restrict which newsgroups are displayed.
        !            89: See the discussion of the \*(L'a\*(R' command on the newsgroup selection
        !            90: level.
        !            91: .PP
        !            92: .I Rn
        !            93: operates on three levels: the newsgroup selection level, the article
        !            94: selection level, and the paging level.
        !            95: Each level has its own set of commands, and its own help menu.
        !            96: At the paging level (the bottom level),
        !            97: .I rn
        !            98: behaves much like the
        !            99: .IR more (1)
        !           100: program.
        !           101: At the article selection level, you may specify which article you want
        !           102: next, or read them in the default order, which is either in order of
        !           103: arrival on your system, or by subject threads.
        !           104: At the newsgroup selection level (the top level), you may specify which
        !           105: newsgroup you want next, or read them in the default order, which is the
        !           106: order that the newsgroups occur in your
        !           107: .I .newsrc
        !           108: file.
        !           109: (You will therefore want to rearrange your
        !           110: .I .newsrc
        !           111: file to put the most interesting newsgroups first.
        !           112: This can be done with the \*(L'm\*(R' command on the Newsgroup Selection level.
        !           113: WARNING: invoking readnews/vnews (the old user interface) in any way (including
        !           114: as a news checker in your login sequence!) will cause your
        !           115: .I .newsrc
        !           116: to be disarranged again.)
        !           117: .PP
        !           118: On any level, at ANY prompt, an \*(L'h\*(R' may be typed for a list of
        !           119: available commands.
        !           120: This is probably the most important command to remember, so don't you
        !           121: forget it.
        !           122: Typing space to any question means to do the normal thing.
        !           123: You will know what that is because
        !           124: every prompt has a list of several plausible commands enclosed in
        !           125: square brackets.
        !           126: The first command in the list is the one which will be done if you type
        !           127: a space.
        !           128: (All input is done in cbreak mode, so carriage returns should not be typed
        !           129: to terminate anything except certain multi-character commands.
        !           130: Those commands will be obvious in the discussion below because they take an
        !           131: argument.)
        !           132: .PP
        !           133: Upon startup,
        !           134: .I rn
        !           135: will do several things:
        !           136: .Ip 1. 4
        !           137: It will look for your
        !           138: .I .newsrc
        !           139: file, which is your list of subscribed-to
        !           140: newsgroups.
        !           141: If
        !           142: .I rn
        !           143: doesn't find a
        !           144: .IR .newsrc ,
        !           145: it will create one.
        !           146: If it does find one, it will back it up under the name \*(L".oldnewsrc\*(R".
        !           147: .Ip 2. 4
        !           148: It will input your
        !           149: .I .newsrc
        !           150: file, listing out the first several newsgroups
        !           151: with unread news.
        !           152: .Ip 3. 4
        !           153: It will perform certain consistency checks on your
        !           154: .IR .newsrc .
        !           155: If your
        !           156: .I .newsrc
        !           157: is out of date in any of several ways,
        !           158: .I rn
        !           159: will warn you and patch it up for you, but you may have to wait a little
        !           160: longer for it to start up.
        !           161: .Ip 4. 4
        !           162: .I Rn
        !           163: will next check to see if any new newsgroups have been created, and give
        !           164: you the opportunity to add them to your
        !           165: .IR .newsrc .
        !           166: .Ip 5. 4
        !           167: .I Rn
        !           168: goes into the top prompt level\*(--the newsgroup selection level.
        !           169: .Sh "Newsgroup Selection Level"
        !           170: In this section the words \*(L"next\*(R" and \*(L"previous\*(R" refer to
        !           171: the ordering of the newsgroups in your
        !           172: .I .newsrc
        !           173: file.
        !           174: On the newsgroup selection level, the prompt looks like this:
        !           175: .Sp
        !           176: ******** 17 unread articles in net.blurfl\*(--read now? [ynq]
        !           177: .Sp
        !           178: and the following commands may be given at this level:
        !           179: .Ip y,SP 8
        !           180: Do this newsgroup now.
        !           181: .Ip .command 8
        !           182: Do this newsgroup now, but execute
        !           183: .I command
        !           184: before displaying anything.
        !           185: The command will be interpreted as if given on the article selection level.
        !           186: .Ip = 8
        !           187: Do this newsgroup now, but list subjects before displaying articles.
        !           188: .Ip n 8
        !           189: Go to the next newsgroup with unread news.
        !           190: .Ip N 8
        !           191: Go to the next newsgroup.
        !           192: .Ip p 8
        !           193: Go to the previous newsgroup with unread news.
        !           194: If there is none, stay at the current newsgroup.
        !           195: .Ip P 8
        !           196: Go to the previous newsgroup.
        !           197: .Ip \- 8
        !           198: Go to the previously displayed newsgroup (regardless of whether it is
        !           199: before or after the current one in the list).
        !           200: .Ip 1 8
        !           201: Go to the first newsgroup.
        !           202: .Ip ^ 8
        !           203: Go to the first newsgroup with unread news.
        !           204: .Ip $ 8
        !           205: Go to the end of the newsgroups list.
        !           206: .Ip "g newsgroup" 8
        !           207: Go to
        !           208: .IR newsgroup .
        !           209: If it isn't currently subscribed to, you will be asked if you want to
        !           210: subscribe.
        !           211: .Ip "/pattern" 8
        !           212: Scan forward for a newsgroup matching
        !           213: .IR pattern .
        !           214: Patterns do globbing like filenames, i.e., use ? to match a single
        !           215: character, * to match any sequence of characters, and [] to specify a list
        !           216: of characters to match.
        !           217: (\*(L"all\*(R" may be used as a synonym for \*(L"*\*(R".)
        !           218: Unlike normal filename globbing, newsgroup searching is not anchored to
        !           219: the front and back of the filename, i.e. \*(L"/jok\*(R" will find
        !           220: net.jokes.
        !           221: You may use ^ or $ to anchor the front or back of the search:
        !           222: \*(L"/^test$\*(R" will find newsgroup test and nothing else
        !           223: If you want to include newsgroups with 0 unread articles, append /r.
        !           224: If the newsgroup is not found between the current newsgroup and the last
        !           225: newsgroup, the search will wrap around to the beginning.
        !           226: .Ip "?pattern" 8
        !           227: Same as /, but search backwards.
        !           228: .Ip u 8
        !           229: Unsubscribe from current newsgroup.
        !           230: .Ip "l string" 8
        !           231: List newsgroups not subscribed to which contain the string specified.
        !           232: .Ip L 8 13v
        !           233: Lists the current state of the
        !           234: .IR .newsrc ,
        !           235: along with status information.
        !           236: .Sp
        !           237: .nf
        !           238:     \h'|0.5i'Status    \h'|2i'Meaning
        !           239:     \h'|0.5i'<number>  \h'|2i'Count of unread articles in newsgroup.
        !           240:     \h'|0.5i'READ      \h'|2i'No unread articles in newsgroup.
        !           241:     \h'|0.5i'UNSUB     \h'|2i'Unsubscribed newsgroup.
        !           242:     \h'|0.5i'BOGUS     \h'|2i'Bogus newsgroup.
        !           243:     \h'|0.5i'JUNK      \h'|2i'Ignored line in .newsrc
        !           244: \h'|2i'(e.g. readnews \*(L"options\*(R" line).
        !           245: .fi
        !           246: .Sp
        !           247: (A bogus newsgroup is one that is not in the list of active newsgroups
        !           248: in the active file, which on most systems is /usr/lib/news/active.)
        !           249: .Ip "m name" 8
        !           250: Move the named newsgroup somewhere else in the
        !           251: .IR .newsrc .
        !           252: If no name is given, the current newsgroup is moved.
        !           253: There are a number of ways to specify where you want the newsgroup\*(--type
        !           254: h for help when it asks where you want to put it.
        !           255: .Ip c 8
        !           256: Catch up\*(--mark all unread articles in this newsgroup as read.
        !           257: .Ip "o pattern" 8
        !           258: Only display those newsgroups whose name matches
        !           259: .IR pattern .
        !           260: Patterns are the same as for the \*(L'/\*(R' command.
        !           261: Multiple patterns may be separated by spaces, just as on the
        !           262: command line.
        !           263: The restriction will remain in effect either until there are no articles
        !           264: left in the restricted set of newsgroups, or another restriction command
        !           265: is given.
        !           266: Since
        !           267: .I pattern
        !           268: is optional, \*(L'o\*(R' by itself will remove the
        !           269: restriction.
        !           270: .Ip "a pattern" 8
        !           271: Add new newsgroups matching
        !           272: .IR pattern .
        !           273: Newsgroups which are already in your
        !           274: .I .newsrc
        !           275: file, whether subscribed to or
        !           276: not, will not be listed.
        !           277: If any new newsgroups are found, you will be asked for each one whether
        !           278: you would like to add it.
        !           279: After any new newsgroups have been added, the \*(L'a\*(R' command also
        !           280: restricts the current set of newsgroups just like the \*(L'o\*(R' command
        !           281: does.
        !           282: .Ip & 8
        !           283: Print out the current status of command line switches and any newsgroup
        !           284: restrictions.
        !           285: .Ip "&switch {switch}" 8
        !           286: Set additional command line switches.
        !           287: .Ip && 8
        !           288: Print out the current macro definitions.
        !           289: .Ip "&&keys commands" 8
        !           290: Define additional macros.
        !           291: .Ip !command 8
        !           292: Escape to a subshell.
        !           293: One exclamation mark (!) leaves you in your own news directory.
        !           294: A double exclamation mark (!!) leaves you in the spool
        !           295: directory for news, which on most systems is /usr/spool/news.
        !           296: The environment variable SHELL will be used if defined.
        !           297: If
        !           298: .I command
        !           299: is null, an interactive shell is started.
        !           300: .Ip q 8
        !           301: Quit.
        !           302: .Ip x 8
        !           303: Quit, restoring .newsrc to its state at startup of
        !           304: .IR rn .
        !           305: The .newsrc you would have had if you had exited with \*(L'q\*(R' will be
        !           306: called .newnewsrc, in case you didn't really want to type \*(L'x\*(R'.
        !           307: .Ip ^K 8
        !           308: Edit the global KILL file.
        !           309: This is a file which contains /pattern/j commands (one per line) to be
        !           310: applied to every newsgroup as it is started up, that is, when it is
        !           311: selected on the newsgroup selection level.
        !           312: The purpose of a KILL file is to mark articles as read on the basis of some
        !           313: set of patterns.
        !           314: This saves considerable wear and tear on your \*(L'n\*(R' key.
        !           315: There is also a local KILL file for each newsgroup.
        !           316: Because of the overhead involved in searching for articles to kill, it is
        !           317: better if possible to use a local KILL file.
        !           318: Local KILL files are edited with a \*(L'^K\*(R' on the article selection level.
        !           319: There are also automatic ways of adding search commands to the local KILL
        !           320: file\*(--see the \*(L'K\*(R' command and the K search modifier on the
        !           321: article selection level.
        !           322: .Sp
        !           323: If either of the environment variables VISUAL or EDITOR is set, the
        !           324: specified editor will be invoked; otherwise a default editor (normally vi(1))
        !           325: is invoked on the KILL file.
        !           326: .Sh "Article Selection Level"
        !           327: On the article selection level,
        !           328: .I rn
        !           329: selects (by default) unread articles in numerical order (the order in which
        !           330: articles have arrived at your site).
        !           331: If you do a subject search (^N), the default order is modified to be
        !           332: numerical order within each subject thread.
        !           333: You may switch back and forth between numerical order and subject thread
        !           334: order at will.
        !           335: The
        !           336: .B \-S
        !           337: switch can be used to make subject search mode the default.
        !           338: .Sp
        !           339: On the article selection level you are
        !           340: .I not
        !           341: asked whether you want to read an article before the article is displayed;
        !           342: rather,
        !           343: .I rn
        !           344: simply displays the first page (or portion of a page, at low baud rates) of the
        !           345: article and asks if you want to continue.
        !           346: The normal article selection prompt comes at the END of the article
        !           347: (though article selection commands can be given from within the middle
        !           348: of the article (the pager level) also).
        !           349: The prompt at the end of an article looks like this:
        !           350: .Sp 
        !           351: End of article 248 (of 257)\*(--what next? [npq]
        !           352: .Sp
        !           353: The following are the options at this point:
        !           354: .Ip n,SP 8
        !           355: Scan forward for next unread article.
        !           356: (Note: the \*(L'n\*(R' (next) command when typed at the end of an article
        !           357: does not mark the article as read, since an article is automaticaly marked
        !           358: as read after the last line of it is printed.
        !           359: It is therefore possible to type a sequence such as \*(L'mn\*(R' and leave
        !           360: the article marked as unread.
        !           361: The fact that an article is marked as read by typing \*(L'n\*(R',
        !           362: \&\*(L'N\*(R', \*(L'^N\*(R', \*(L's\*(R', or \*(L'S\*(R' within the MIDDLE of
        !           363: the article is in fact a special case.)
        !           364: .Ip N 8
        !           365: Go to the next article.
        !           366: .Ip ^N 8
        !           367: Scan forward for the next article with the same subject, and make ^N default
        !           368: (subject search mode).
        !           369: .Ip p 8
        !           370: Scan backward for previous unread article.
        !           371: If there is none, stay at the current article.
        !           372: .Ip P 8
        !           373: Go to the previous article.
        !           374: .Ip \- 8
        !           375: Go to the previously displayed article (regardless of whether that article
        !           376: is before or after this article in the normal sequence).
        !           377: .Ip ^P 8
        !           378: Scan backward for the previous article with the same subject, and make
        !           379: ^N default (subject search mode).
        !           380: .Ip ^R 8
        !           381: Restart the current article.
        !           382: .Ip v 8
        !           383: Restart the current article verbosely, displaying the entire header.
        !           384: .Ip ^L 8
        !           385: Refresh the screen.
        !           386: .Ip ^X 8
        !           387: Restart the current article, and decrypt as a rot13 message.
        !           388: .Ip X 8
        !           389: Refresh the screen, and decrypt as a rot13 message.
        !           390: .Ip b 8
        !           391: Back up one page.
        !           392: .Ip q 8
        !           393: Quit this newsgroup and go back to the newsgroup selection level.
        !           394: .Ip ^ 8
        !           395: Go to the first unread article.
        !           396: .Ip $ 8
        !           397: Go to the last article (actually, one past the last article).
        !           398: .Ip "number" 8
        !           399: Go to the numbered article.
        !           400: .Ip "range{,range} command{:command}" 8
        !           401: Apply a set of commands to a set of articles.
        !           402: A range consists of either <article number> or
        !           403: <article\ number>\-<article\ number>.
        !           404: A dot \*(L'.\*(R' represents the current article, and a dollar
        !           405: sign \*(L'$\*(R' represents the last article.
        !           406: .Sp
        !           407: Applicable commands include \*(L'm\*(R' (mark as unread), \*(L'M\*(R'
        !           408: (delayed mark as unread), \*(L'j\*(R' (mark as read), \*(L"s dest\*(R"
        !           409: (save to a destination), \*(L"!command\*(R" (shell escape), \*(L"=\*(R"
        !           410: (print the subject) and \*(L"C\*(R" (cancel).
        !           411: .Ip j 8
        !           412: Junk the current article\*(--mark it as read.
        !           413: If this command is used from within an article, you are left at the end of
        !           414: the article, unlike \*(L'n\*(R', which looks for the next article.
        !           415: .Ip m 8
        !           416: Mark the current article as still unread.
        !           417: (If you are in subject search mode you probably want to use M instead of m.
        !           418: Otherwise the current article may be selected as the beginning of the next
        !           419: subject thread.)
        !           420: .Ip M 8
        !           421: Mark the current article as still unread, but not until the newsgroup
        !           422: is exited.
        !           423: Until then, the current article will be marked as read.
        !           424: This is useful for returning to an article in another session, or in another
        !           425: newsgroup.
        !           426: .Ip /pattern 8
        !           427: Scan forward for article containing
        !           428: .I pattern
        !           429: in the subject.
        !           430: See the section on Regular Expressions.
        !           431: Together with the escape substitution facility described later, it becomes
        !           432: easy to search for various attributes of the current article, such as
        !           433: subject, article ID, author name, etc.
        !           434: The previous pattern can be recalled with \*(L"<esc>/\*(R".
        !           435: If
        !           436: .I pattern
        !           437: is omitted, the previous pattern is assumed.
        !           438: .Ip /pattern/h 8
        !           439: Scan forward for article containing
        !           440: .I pattern
        !           441: in the header.
        !           442: .Ip /pattern/a 8
        !           443: Scan forward for article containing
        !           444: .I pattern
        !           445: anywhere in article.
        !           446: .Ip /pattern/r 8
        !           447: Scan read articles also.
        !           448: .Ip /pattern/c 8
        !           449: Make search case sensitive.
        !           450: Ordinarily upper and lower case are considered the same.
        !           451: .Ip "/pattern/modifiers:command{:command}" 8
        !           452: Apply the commands listed to articles matching the search command (possibly
        !           453: with h, a, or r modifiers).
        !           454: Applicable commands include \*(L'm\*(R' (mark as unread), \*(L'M\*(R'
        !           455: (delayed mark as unread), \*(L'j\*(R' (mark as read), \*(L"s dest\*(R"
        !           456: (save to a destination), \*(L"!command\*(R" (shell escape), \*(L"=\*(R"
        !           457: (print the subject) and \*(L"C\*(R" (cancel).
        !           458: If the first command is \*(L'm\*(R' or \*(L'M\*(R', modifier r is assumed.
        !           459: A K may be included in the modifiers (not the commands) to cause the
        !           460: entire command (sans K) to be saved to the local KILL file, where it will
        !           461: be applied to every article that shows up in the newsgroup.
        !           462: .Sp
        !           463: For example, to save all articles in a given newsgroup to the line printer
        !           464: and mark them read, use \*(L"/^/\||\|lpr:j\*(R".
        !           465: If you say \*(L"/^/K\||\|lpr:j\*(R", this will happen every time you enter the
        !           466: newsgroup.
        !           467: .Ip ?pattern 8
        !           468: Scan backward for article containing
        !           469: .I pattern
        !           470: in the subject.
        !           471: May be modified as the forward search is: ?pattern?modifiers[:commands].
        !           472: It is likely that you will want an r modifier when scanning backward.
        !           473: .Ip k 8
        !           474: Mark as read all articles with the same subject as the current article.
        !           475: (Note: there is no single character command to temporarily mark as read (M
        !           476: command) articles matching the current subject.
        !           477: That can be done with \*(L"/<esc>s/M\*(R", however.)
        !           478: .Ip K 8
        !           479: Do the same as the k command, but also add a line to the local KILL file for
        !           480: this newsgroup to kill this subject every time the newsgroup is started up.
        !           481: For a discussion of KILL files, see the \*(L'^K\*(R' command below.
        !           482: See also the K modifier on searches above.
        !           483: .Ip ^K 8
        !           484: Edit the local KILL file for this newsgroup.
        !           485: Each line of the KILL file should be a command of the form /pattern/j.
        !           486: (With the exception that
        !           487: .I rn
        !           488: will insert a line at the beginning of the form \*(L"THRU <number>\*(R",
        !           489: which tells
        !           490: .I rn
        !           491: the maximum article number that the KILL file has been applied to.  You
        !           492: may delete the THRU line to force a rescan of current articles.)
        !           493: You may also have reason to use the m, h, or a modifiers.
        !           494: Be careful with the M modifier in a kill file\*(--there are more efficient
        !           495: ways to never read an article.
        !           496: You might have reason to use it if a particular series of articles is posted
        !           497: to multiple newsgroups.
        !           498: In this case, M would force you to view the article in a different newsgroup.
        !           499: .Sp
        !           500: To see only newgroup articles in the control newsgroup, for instance, you
        !           501: might put
        !           502: .Sp
        !           503: /^/j
        !           504: .br
        !           505: /newgroup/m
        !           506: .Sp
        !           507: which kills all subjects not containing \*(L"newgroup\*(R".
        !           508: You can add lines automatically via the K command and K search modifiers,
        !           509: but editing is the only way to remove lines.
        !           510: If either of the environment variables VISUAL or EDITOR is set, the
        !           511: specified editor will be invoked; otherwise a default editor (normally vi)
        !           512: is invoked on the KILL file.
        !           513: .Sp
        !           514: The KILL file may also contain switch setting lines beginning with \*(L'&\*(R'.
        !           515: Additionally, any line beginning with \*(L'X\*(R' is executed on exit
        !           516: from the newsgroup rather than on entrance.
        !           517: This can be used to set switches back to a default value.
        !           518: .Ip r 8
        !           519: Reply through net mail.
        !           520: The environment variables MAILPOSTER and MAILHEADER may be used to modify
        !           521: the mailing behavior of
        !           522: .I rn
        !           523: (see environment section).
        !           524: If on a nonexistent article such as the "End of newsgroup" pseudo-article
        !           525: (which you can get to with a \*(L'$\*(R' command), invokes the mailer to
        !           526: nobody in particular.
        !           527: .Ip R 8
        !           528: Reply, including the current article in the header file generated.
        !           529: (See \*(L'F\*(R' command below).
        !           530: The YOUSAID environment variable controls the format of the attribution line.
        !           531: .Ip f 8
        !           532: Submit a followup article.
        !           533: If on a nonexistent article such as the "End of newsgroup" pseudo-article
        !           534: (which you can get to with a \*(L'$\*(R' command), posts an original
        !           535: article (basenote).
        !           536: .Ip F 8
        !           537: Submit a followup article, and include the old article, with lines prefixed
        !           538: either by \*(L">\*(R" or by the argument to a
        !           539: .B \-F
        !           540: switch.
        !           541: .I Rn
        !           542: will attempt to provide an attribution line in front of the quoted article,
        !           543: generated from the From: line of the article.
        !           544: Unfortunately, the From: line doesn't always contain the right name; you
        !           545: should double check it against the signature and change it if necessary,
        !           546: or you may have to apologize for quoting the wrong person.
        !           547: The environment variables NEWSPOSTER, NEWSHEADER and ATTRIBUTION may be
        !           548: used to modify the posting behavior of
        !           549: .I rn
        !           550: (see environment section).
        !           551: .Ip C 8
        !           552: Cancel the current article, but only if you are the contributor or superuser.
        !           553: .Ip c 8
        !           554: Catch up in this newsgroup; i.e., mark all articles as read.
        !           555: .Ip u 8
        !           556: Unsubscribe to this newsgroup.
        !           557: .Ip "s destination" 8
        !           558: Save to a filename or pipe using sh.
        !           559: If the first character of the destination is a vertical bar, the rest of
        !           560: the command is considered a shell command to which the article is passed
        !           561: through standard input.
        !           562: The command is subject to filename expansion.
        !           563: (See also the environment variable PIPESAVER.)
        !           564: If the destination does not begin with a vertical bar, the rest of the
        !           565: command is assumed to be a filename of some sort.
        !           566: An initial tilde \*(L'~\*(R' will be translated to the name of the home
        !           567: directory, and an initial environment variable substitution is also allowed.
        !           568: If only a directory name is specified, the environment variable SAVENAME
        !           569: is used to generate the actual name.
        !           570: If only a filename is specified (i.e. no directory), the environment variable
        !           571: SAVEDIR will be used to generate the actual directory.
        !           572: If nothing is specified, then obviously both variables will be used.
        !           573: Since the current directory for rn while doing a save command is your
        !           574: private news directory, saying \*(L"s ./filename\*(R" will force the file
        !           575: to your news directory.
        !           576: Save commands are also run through % interpretation, so that you can
        !           577: say \*(L"s %O/filename\*(R" to save to the directory you were in when you ran
        !           578: .IR rn ,
        !           579: and \*(L"s %t\*(R" to save to a filename consisting of the Internet address
        !           580: of the sender.
        !           581: .Sp
        !           582: After generating the full pathname of the file to save to,
        !           583: .I rn
        !           584: determines if the file exists already, and if so, appends to it.
        !           585: .I Rn
        !           586: will attempt to determine if an existing file is a mailbox or a normal file,
        !           587: and save the article in the same format.
        !           588: If the output file does not yet exist,
        !           589: .I rn
        !           590: will by default ask you which format you want, or you can make it skip the
        !           591: question with either the
        !           592: .B \-M
        !           593: or
        !           594: .B \-N
        !           595: switch.
        !           596: If the article is to be saved in mailbox format, the command to do so is
        !           597: generated from the environment variable MBOXSAVER.
        !           598: Otherwise, NORMSAVER is used.
        !           599: .Ip "S destination" 8
        !           600: Save to a filename or pipe using a preferred shell, such as csh.
        !           601: Which shell is used depends first on what you have the environment variable
        !           602: SHELL set to, and in the absence of that, on what your news administrator
        !           603: set for the preferred shell when he or she installed
        !           604: .IR rn .
        !           605: .Ip "| command" 8
        !           606: Shorthand for \*(L"s | command\*(R".
        !           607: .Ip "w destination" 8
        !           608: The same as \*(L"s destination\*(R", but saves without the header.
        !           609: .Ip "W destination" 8
        !           610: The same as \*(L"S destination\*(R", but saves without the header.
        !           611: .Ip & 8
        !           612: Print out the current status of command line switches.
        !           613: .Ip "&switch {switch}" 8
        !           614: Set additional command line switches.
        !           615: .Ip && 8
        !           616: Print out current macro definitions.
        !           617: .Ip "&&keys commands" 8
        !           618: Define an additional macro.
        !           619: .Ip !command 8
        !           620: Escape to a subshell.
        !           621: One exclamation mark (!) leaves you in your own news directory.
        !           622: A double exclamation mark (!!) leaves you in the spool
        !           623: directory of the current newsgroup.
        !           624: The environment variable SHELL will be used if defined.
        !           625: If
        !           626: .I command
        !           627: is null, an interactive shell is started.
        !           628: .Sp
        !           629: You can use escape key substitutions described later to get to many
        !           630: run-time values.
        !           631: The command is also run through % interpretation, in case it is being called
        !           632: from a range or search command.
        !           633: .Ip = 8
        !           634: List subjects of unread articles.
        !           635: .Ip # 8
        !           636: Print last article number.
        !           637: .Sh "Pager Level"
        !           638: At the pager level (within an article), the prompt looks like this:
        !           639: .Sp
        !           640: \*(--MORE\*(--(17%)
        !           641: .Sp
        !           642: and a number of commands may be given:
        !           643: .Ip SP 8
        !           644: Display next page.
        !           645: .Ip x 8
        !           646: Display next page and decrypt as a rot13 message.
        !           647: .Ip d,^D 8
        !           648: Display half a page more.
        !           649: .Ip CR 8
        !           650: Display one more line.
        !           651: .Ip q 8
        !           652: Go to the end of the current article (don't mark it either read or unread).
        !           653: Leaves you at the \*(L"What next?\*(R" prompt.
        !           654: .Ip j 8
        !           655: Junk the current article.
        !           656: Mark it read and go to the end of the article.
        !           657: .Ip ^L 8
        !           658: Refresh the screen.
        !           659: .Ip X 8
        !           660: Refresh the screen and decrypt as a rot13 message.
        !           661: .Ip b,^B 8
        !           662: Back up one page.
        !           663: .Ip gpattern 8
        !           664: Goto (search forward for)
        !           665: .I pattern
        !           666: within current article.
        !           667: Note that there is no space between the command and the pattern.
        !           668: If the pattern is found, the page containing the pattern will be displayed.
        !           669: Where on the page the line matching the pattern goes depends on the value
        !           670: of the
        !           671: .B \-g
        !           672: switch.
        !           673: By default the matched line goes at the top of the screen.
        !           674: .Ip G 8
        !           675: Search for g pattern again.
        !           676: .Ip ^G 8
        !           677: This is a special version of the \*(L'g\*(R' command that is for skipping
        !           678: articles in a digest.
        !           679: It is equivalent to setting \*(L"\-g4\*(R" and then executing the command
        !           680: \*(L"g^Subject:\*(R".
        !           681: .Ip TAB 8
        !           682: This is another special version of the \*(L'g\*(R' command that is for
        !           683: skipping inclusions of older articles.
        !           684: It is equivalent to setting \*(L"\-g4\*(R" and then executing the command
        !           685: \*(L"g^[^c]\*(R", where \fIc\fR is the first character of the last line
        !           686: on the screen.
        !           687: It searches for the first line that doesn't begin with the same character
        !           688: as the last line on the screen.
        !           689: .Ip !command 8
        !           690: Escape to a subshell.
        !           691: .PP
        !           692: The following commands skip the rest of the current article, then behave just
        !           693: as if typed to the \*(L"What next?\*(R" prompt at the end of the article.
        !           694: See the documentation at the article selection level for these commands.
        !           695: .Sp    
        !           696:     # $ & / = ? c C f F k K ^K m M r R ^R u v Y ^
        !           697: .br
        !           698:     number
        !           699: .br
        !           700:     range{,range} command{:command}
        !           701: .Sp
        !           702: The following commands also skip to the end of the article, but have the
        !           703: additional effect of marking the current article as read:
        !           704: .Sp
        !           705:     n N ^N s S | w W
        !           706: .Sp
        !           707: .Sh "Miscellaneous facts about commands"
        !           708: An \*(L'n\*(R' typed at either the \*(L"Last newsgroup\*(R" prompt or a
        !           709: \*(L"Last article\*(R" prompt will cycle back to the top of the newsgroup
        !           710: or article list, whereas a \*(L'q\*(R' will quit the level.
        !           711: (Note that \*(L'n\*(R' does not mean \*(L"no\*(R", but rather
        !           712: \*(L"next\*(R".)
        !           713: A space will of course do whatever is shown as the
        !           714: default, which will vary depending on whether rn thinks you have more
        !           715: articles or newsgroups to read.
        !           716: .PP
        !           717: The \*(L'b\*(R' (backup page) command may be repeated until the beginning of
        !           718: the article is reached.
        !           719: If
        !           720: .I rn
        !           721: is suspended (via a ^Z), then when the job is resumed, a refresh (^L) will
        !           722: automatically be done (Berkeley-type systems only).
        !           723: If you type a command such as \*(L'!\*(R' or \*(L's\*(R' which takes you
        !           724: from the middle of the article to the end, you can always get back into the
        !           725: middle by typing \*(L'^L\*(R'.
        !           726: .PP
        !           727: In multi-character commands such as \*(L'!\*(R', \*(L's\*(R', \*(L'/\*(R',
        !           728: etc, you can interpolate various run-time values by typing escape and a
        !           729: character.
        !           730: To find out what you can interpolate, type escape and \*(L'h\*(R', or check
        !           731: out the single character % substitutions for environment variables in the
        !           732: Interpretation and Interpolation section, which are the same.
        !           733: Additionally, typing a double escape will cause any % substitutions in the
        !           734: string already typed in to be expanded.
        !           735: .Sh "Options"
        !           736: .I Rn
        !           737: has a nice set of options to allow you to tailor the interaction
        !           738: to your liking.
        !           739: (You might like to know that the author swears by \*(L"\-e \-m \-S \-/\*(R".)
        !           740: These options may be set on the command line, via the RNINIT
        !           741: environment variable, via a file pointed to by the RNINIT variable, or
        !           742: from within rn via the & command.
        !           743: Options may generally be unset by saying \*(L"+switch\*(R".
        !           744: Options include:
        !           745: .TP 5
        !           746: .B \-c
        !           747: checks for news without reading news.
        !           748: If a list of newsgroups is given on the command line, only those newsgroups
        !           749: will be checked; otherwise all subscribed-to newsgroups are checked.
        !           750: Whenever the
        !           751: .B \-c
        !           752: switch is specified, a non-zero exit status from
        !           753: .I rn
        !           754: means that there is unread news in one of the checked newsgroups.
        !           755: The
        !           756: .B \-c
        !           757: switch does not disable the printing of newsgroups with unread news;
        !           758: this is controlled by the
        !           759: .B \-s
        !           760: switch.
        !           761: (The
        !           762: .B \-c
        !           763: switch is not meaningful when given via the & command.)
        !           764: .TP 5
        !           765: .B \-C<number>
        !           766: tells
        !           767: .I rn
        !           768: how often to checkpoint the
        !           769: .IR .newsrc ,
        !           770: in articles read.
        !           771: Actually, this number says when to start thinking about doing a checkpoint
        !           772: if the situation is right.
        !           773: If a reasonable checkpointing situation doesn't arise within 10 more
        !           774: articles, the
        !           775: .I .newsrc
        !           776: is checkpointed willy-nilly.
        !           777: .TP 5
        !           778: .B \-d<directory name>
        !           779: sets the default save directory to something other than ~/News.
        !           780: The directory name will be globbed (via csh) if necessary (and if possible).
        !           781: Articles saved by
        !           782: .I rn
        !           783: may be placed in the save directory or in a subdirectory thereof depending
        !           784: on the command that you give and the state of the environment variables
        !           785: SAVEDIR and SAVENAME.
        !           786: Any KILL files (see the K command in the Article Selection section)
        !           787: also reside in this directory and its subdirectories, by default.
        !           788: In addition, shell escapes leave you in this directory.
        !           789: .TP 5
        !           790: .B \-D<flags>
        !           791: enables debugging output.
        !           792: See common.h for flag values.
        !           793: Warning: normally
        !           794: .I rn
        !           795: attempts to restore your
        !           796: .I .newsrc
        !           797: when an unexpected signal or internal error occurs.
        !           798: This is disabled when any debugging flags are set.
        !           799: .TP 5
        !           800: .B \-e
        !           801: causes each page within an article to be started at the top of the screen,
        !           802: not just the first page.
        !           803: (It is similar to the
        !           804: .B \-c
        !           805: switch of
        !           806: .IR more (1).)
        !           807: You never have to read scrolling text with this switch.
        !           808: This is helpful especially at certain baud rates because you can start reading
        !           809: the top of the next page without waiting for the whole page to be printed.
        !           810: It works nicely in conjuction with the
        !           811: .B \-m
        !           812: switch, especially if you use half-intensity for your highlight mode.
        !           813: See also the
        !           814: .B \-L
        !           815: switch.
        !           816: .TP 5
        !           817: .B \-E<name>=<val>
        !           818: sets the environment variable <name> to the value specified.
        !           819: Within
        !           820: .IR rn ,
        !           821: \*(L"&\-ESAVENAME=%t\*(R" is similar to \*(L"setenv SAVENAME '%t'\*(R" in
        !           822: .IR csh ,
        !           823: or \*(L"SAVENAME='%t'; export SAVENAME\*(R" in
        !           824: .IR sh .
        !           825: Any environment variables set with
        !           826: .B \-E
        !           827: will be inherited by subprocesses of
        !           828: .IR rn .
        !           829: .TP 5
        !           830: .B \-F<string>
        !           831: sets the prefix string for the \*(L'F\*(R' followup command to use in
        !           832: prefixing each line of the quoted article.
        !           833: For example, \*(L"\-F<tab>\*(R" inserts a tab on the front of each line
        !           834: (which will cause long lines to wrap around, unfortunately),
        !           835: \*(L"\-F>>>>\*(R" inserts \*(L">>>>\*(R" on every line, and
        !           836: \*(L"\-F\*(R" by itself causes nothing to be inserted, in case you want to
        !           837: reformat the text, for instance.
        !           838: The initial default prefix is \*(L">\*(R".
        !           839: .TP 5
        !           840: .B \-g<line>
        !           841: tells
        !           842: .I rn
        !           843: which line of the screen you want searched-for strings to show up on when
        !           844: you search with the \*(L'g\*(R' command within an article.
        !           845: The lines are numbered starting with 1.
        !           846: The initial default is \*(L"\-g1\*(R", meaning the first line of the screen.
        !           847: Setting the line to less than 1 or more than the number of lines on the screen
        !           848: will set it to the last line of the screen.
        !           849: .TP 5
        !           850: .B \-h<string>
        !           851: hides (disables the printing of) all header lines beginning with
        !           852: .I string.
        !           853: For instance, \-hexp will disable the printing of the \*(L"Expires:\*(R" line.
        !           854: Case is insignificant.
        !           855: If <string> is null, all header lines except Subject are hidden, and you
        !           856: may then use
        !           857: .B +h
        !           858: to select those lines you want to see.
        !           859: You may wish to use the baud-rate switch modifier below to hide more lines
        !           860: at lower baud rates.
        !           861: .TP 5
        !           862: .B \-H<string>
        !           863: works just like
        !           864: .B \-h
        !           865: except that instead of setting the hiding flag for a header line, it sets
        !           866: the magic flag for that header line.
        !           867: Certain header lines have magic behavior that can be controlled this way.
        !           868: At present, the following actions are caused by the flag for the particular
        !           869: line:
        !           870: the Newsgroups line will only print when there are multiple newsgroups,
        !           871: the Subject line will be underlined, and the Expires line will always be
        !           872: suppressed if there is nothing on it.
        !           873: In fact, all of these actions are the default, and you must use
        !           874: .B +H
        !           875: to undo them.
        !           876: .TP 5
        !           877: .B \-i=<number>
        !           878: specifies how long (in lines) to consider the initial page of an
        !           879: article\*(--normally this is determined automatically depending on baud rate.
        !           880: (Note that an entire article header will always be printed regardless of the
        !           881: specified initial page length.
        !           882: If you are working at low baud rate and wish to reduce the size of the
        !           883: headers, you may hide certain header lines with the
        !           884: .B \(bsh
        !           885: switch.)
        !           886: .TP 5
        !           887: .B \-l
        !           888: disables the clearing of the screen at the beginning of each
        !           889: article, in case you have a bizarre terminal.
        !           890: .TP 5
        !           891: .B \-L
        !           892: tells
        !           893: .I rn
        !           894: to leave information on the screen as long as possible by not blanking
        !           895: the screen between pages, and by using clear to end-of-line.
        !           896: (The
        !           897: .IR more (1)
        !           898: program does this.)
        !           899: This feature works only if you have the requisite termcap
        !           900: capabilities.
        !           901: The switch has no effect unless the
        !           902: .B \-e
        !           903: switch is set.
        !           904: .TP 5
        !           905: .B \-m=<mode>
        !           906: enables the marking of the last line of the previous page
        !           907: printed, to help the user see where to continue reading.
        !           908: This is most helpful when less than a full page is going to be displayed.
        !           909: It may also be used in conjunction with the
        !           910: .B \-e
        !           911: switch, in which case the page is erased, and the first line (which is
        !           912: the last line of the previous page) is highlighted.
        !           913: If
        !           914: .B \-m=s
        !           915: is specified, the standout mode will be used, but if
        !           916: .B \-m=u
        !           917: is specified, underlining will be used.
        !           918: If neither
        !           919: .B =s
        !           920: or
        !           921: .B =u
        !           922: is specified, standout is the default.
        !           923: Use
        !           924: .B +m
        !           925: to disable highlighting.
        !           926: .TP 5
        !           927: .B \-M
        !           928: forces mailbox format in creating new save files.
        !           929: Ordinarily you are asked which format you want.
        !           930: .TP 5
        !           931: .B \-N
        !           932: forces normal (non-mailbox) format in creating new save files.
        !           933: Ordinarily you are asked which format you want.
        !           934: .TP 5
        !           935: .B \-r
        !           936: causes
        !           937: .I rn
        !           938: to restart in the last newsgroup read during a previous session with
        !           939: .I rn.
        !           940: It is equivalent to starting up normally and then getting to the newsgroup
        !           941: with a g command.
        !           942: .TP 5
        !           943: .B \-s
        !           944: with no argument suppresses the initial listing of newsgroups with unread
        !           945: news, whether
        !           946: .B \-c
        !           947: is specified or not.
        !           948: Thus
        !           949: .B \-c
        !           950: and
        !           951: .B \-s
        !           952: can be used together to test \*(L"silently\*(R" the status of news from
        !           953: within your
        !           954: .I .login
        !           955: file.
        !           956: If
        !           957: .B \-s
        !           958: is followed by a number, the initial listing is suppressed after that many
        !           959: lines have been listed.
        !           960: Presuming that you have your
        !           961: .I .newsrc
        !           962: sorted into order of interest,
        !           963: .B \-s5
        !           964: will tell you the 5 most interesting newsgroups that have unread news.
        !           965: This is also a nice feature to use in your
        !           966: .I .login
        !           967: file, since it not only tells you whether there is unread news, but also how
        !           968: important the unread news is, without having to wade through the entire
        !           969: list of unread newsgroups.
        !           970: If no 
        !           971: .B \-s
        !           972: switch is given 
        !           973: .B \-s5
        !           974: is assumed, so just putting \*(L"rn \-c\*(R"
        !           975: into your
        !           976: \&.login file is fine.
        !           977: .TP 5
        !           978: .B \-S<number>
        !           979: causes
        !           980: .I rn
        !           981: to enter subject search mode (^N) automatically whenever a newsgroup is
        !           982: started up with <number> unread articles or more.
        !           983: Additionally, it causes any \*(L'n\*(R' typed while in subject search mode
        !           984: to be interpreted as \*(L'^N\*(R' instead.
        !           985: (To get back out of subject search mode, the best command is probably
        !           986: \&\*(L'^\*(R'.)
        !           987: If <number> is omitted, 3 is assumed.
        !           988: .TP 5
        !           989: .B \-t
        !           990: puts
        !           991: .I rn
        !           992: into terse mode.
        !           993: This is more cryptic but useful for low baud rates.
        !           994: (Note that your system administrator may have compiled
        !           995: .I rn
        !           996: with either verbose or terse messages only to save memory.)
        !           997: You may wish to use the baud-rate switch modifier below to enable terse mode
        !           998: only at lower baud rates.
        !           999: .TP 5
        !          1000: .B \-T
        !          1001: allows you to type ahead of rn.
        !          1002: Ordinarily rn will eat typeahead to prevent your autorepeating space bar from
        !          1003: doing a very frustrating thing when you accidentally hold it down.
        !          1004: If you don't have a repeating space bar, or you are working at low baud
        !          1005: rate, you can set this switch to prevent this behavior.
        !          1006: You may wish to use the baud-rate switch modifier below to disable typeahead
        !          1007: only at lower baud rates.
        !          1008: .TP 5
        !          1009: .B \-v
        !          1010: sets verification mode for commands.
        !          1011: When set, the command being executed is displayed to give some feedback that
        !          1012: the key has actually been typed.
        !          1013: Useful when the system is heavily loaded and you give a command that takes
        !          1014: a while to start up.
        !          1015: .TP 5
        !          1016: .B \-/
        !          1017: sets SAVEDIR to \*(L"%p/%c\*(R" and SAVENAME to \*(L"%a\*(R", which means
        !          1018: that by default articles are saved in a subdirectory of your private news
        !          1019: directory corresponding to the name of the the current newsgroup, with the
        !          1020: filename being the article number.
        !          1021: .B +/
        !          1022: sets SAVEDIR to \*(L"%p\*(R" and SAVENAME to \*(L"%^C\*(R", which by
        !          1023: default saves articles directly to your private news directory, with the
        !          1024: filename being the name of the current newsgroup, first letter capitalized.
        !          1025: (Either
        !          1026: .B +/
        !          1027: or
        !          1028: .B \-/
        !          1029: may be default on your system, depending on the feelings of your news
        !          1030: administrator when he, she or it installed
        !          1031: .IR rn .)
        !          1032: You may, of course, explicitly set SAVEDIR and SAVENAME to other values\*(--see
        !          1033: discussion in the environment section.
        !          1034: .PP
        !          1035: Any switch may be selectively applied according to the current baud-rate.
        !          1036: Simply prefix the switch with +speed to apply the switch at that speed or
        !          1037: greater, and \%\-speed to apply the switch at that speed or less.
        !          1038: Examples: \%\-1200\-hposted suppresses the Posted line at 1200 baud or less;
        !          1039: \%+9600\-m enables marking at 9600 baud or more.
        !          1040: You can apply the modifier recursively to itself also: \%+300\-1200\-t sets
        !          1041: terse mode from 300 to 1200 baud.
        !          1042: .PP
        !          1043: Similarly, switches may be selected based on terminal type:
        !          1044: .Sp
        !          1045:        \-=vt100+T              set +T on vt100
        !          1046: .br
        !          1047:        \-=tvi920\-ETERM=mytvi  get a special termcap entry
        !          1048: .br
        !          1049:        \-=tvi920\-ERNMACRO=%./.rnmac.tvi
        !          1050: .br
        !          1051:                                set up special keymappings
        !          1052: .br
        !          1053:        +=paper\-v              set verify mode if not hardcopy
        !          1054: .PP
        !          1055: Some switch arguments, such as environment variable values, may require
        !          1056: spaces in them.
        !          1057: Such spaces should be quoted via ", ', or \e in the conventional fashion,
        !          1058: even when passed via RNINIT or the & command.
        !          1059: .Sh "Regular Expressions"
        !          1060: The patterns used in article searching are regular expressions such as
        !          1061: those used by
        !          1062: .IR ed (1).
        !          1063: In addition, \ew matches an alphanumeric character and \eW a nonalphanumeric.
        !          1064: Word boundaries may be matched by \eb, and non-boundaries by \eB.
        !          1065: The bracketing construct \e(\ ...\ \e) may also be used, and \edigit matches
        !          1066: the digit'th substring, where digit can range from 1 to 9.
        !          1067: \e0 matches whatever the last bracket match matched.
        !          1068: Up to 10 alternatives may given in a pattern, separated by \e|, with the
        !          1069: caveat that \e(\ ...\ \e|\ ...\ \e) is illegal.
        !          1070: .Sh "Interpretation and Interpolation"
        !          1071: Many of the strings that
        !          1072: .I rn
        !          1073: handles are subject to interpretations of several types.
        !          1074: Under filename expansion, an initial \*(L"~/\*(R" is translated to the name
        !          1075: of your home directory, and \*(L"~name\*(R" is translated to the login
        !          1076: directory for the user specified.
        !          1077: Filename expansion will also expand an initial environment variable, and
        !          1078: also does the backslash, uparrow and percent expansion mentioned below.
        !          1079: .PP
        !          1080: All interpreted strings go through backslash, uparrow and percent
        !          1081: interpretation.
        !          1082: The backslash escapes are the normal ones (such as \en, \et, \ennn, etc.).
        !          1083: The uparrow escapes indicate control codes in the normal fashion.
        !          1084: Backslashes or uparrows to be passed through should be escaped with backslash.
        !          1085: The special percent escapes are similar to printf percent escapes.
        !          1086: These cause the substitution of various run-time values into the string.
        !          1087: The following are currently recognized:
        !          1088: .Ip %a 8
        !          1089: Current article number.
        !          1090: .Ip %A 8
        !          1091: Full name of current article (%P/%c/%a).
        !          1092: (On a Eunice system with the LINKART option, %P/%c/%a returns the name of
        !          1093: the article in the current newsgroup, while %A returns the real name of
        !          1094: the article, which may be different if the current article was posted to
        !          1095: multiple newsgroups.)
        !          1096: .Ip %b 8
        !          1097: Destination of last save command, often a mailbox.
        !          1098: .Ip %B 8
        !          1099: The byte offset to the beginning of the part of the article to be saved,
        !          1100: set by the save command.
        !          1101: The \*(L's\*(R' and \*(L'S\*(R' commands set it to 0, and the \*(L'w\*(R'
        !          1102: and \*(L'W\*(R' commands set it to the byte offset of the body of the article.
        !          1103: .Ip %c 8
        !          1104: Current newsgroup, directory form.
        !          1105: .Ip %C 8
        !          1106: Current newsgroup, dot form.
        !          1107: .Ip %d 8
        !          1108: Full name of newsgroup directory (%P/%c).
        !          1109: .Ip %D 8
        !          1110: \*(L"Distribution:\*(R" line from the current article.
        !          1111: .Ip %f 8
        !          1112: \*(L"From:\*(R" line from the current article, or the \*(L"Reply-To:\*(R"
        !          1113: line if there is one.
        !          1114: This differs from %t in that comments (such as the full name) are not
        !          1115: stripped out with %f.
        !          1116: .Ip %F 8
        !          1117: \*(L"Newsgroups:\*(R" line for a new article, constructed from
        !          1118: \*(L"Newsgroups:\*(R" and \*(L"Followup-To:\*(R" lines of current article.
        !          1119: .Ip %h 8
        !          1120: Name of the header file to pass to the mail or news poster,
        !          1121: containing all the information that the poster program needs in the
        !          1122: form of a message header.
        !          1123: It may also contain a copy of the current article.
        !          1124: The format of the header file is controlled by the MAILHEADER and NEWSHEADER
        !          1125: environment variables.
        !          1126: .Ip %H 8
        !          1127: Host name (your machine's name).
        !          1128: .Ip %i 8
        !          1129: \*(L"Message-I.D.:\*(R" line from the current article, with <> guaranteed.
        !          1130: .Ip %I 8
        !          1131: The reference indication mark (see the
        !          1132: .B \-F
        !          1133: switch.)
        !          1134: .Ip %l 8
        !          1135: The news administrator's login name, if any.
        !          1136: .Ip %L 8
        !          1137: Login name (yours).
        !          1138: .Ip %m 8
        !          1139: The current mode of rn, for use in conditional macros.
        !          1140: .Sp
        !          1141: .nf
        !          1142:        i       Initializing.
        !          1143:        n       Newsgroup selection level.
        !          1144:        a       Article selection level (What next?).
        !          1145:        p       Pager level (MORE prompt).
        !          1146:        A       Add this newsgroup?
        !          1147:        C       Catchup confirmation.
        !          1148:        D       Delete bogus newsgroups?
        !          1149:        M       Use mailbox format?
        !          1150:        R       Resubscribe to this newsgroup?
        !          1151: .fi
        !          1152: .Sp
        !          1153: Note that yes/no questions are all upper-case modes.
        !          1154: If, for example, you wanted to disallow defaults on all yes/no questions,
        !          1155: you could define the following macro:
        !          1156: .Sp
        !          1157: .nf
        !          1158: \e040  %(%m=[A-Z]?h: )
        !          1159: .fi
        !          1160: .Ip %M 8
        !          1161: The number of articles marked to return via the \*(L'M\*(R' command.
        !          1162: If the same article is Marked multiple times, \*(L"%M\*(R" counts it
        !          1163: multiple times in the current implementation.
        !          1164: .Ip %n 8
        !          1165: \*(L"Newsgroups:\*(R" line from the current article.
        !          1166: .Ip %N 8
        !          1167: Full name (yours).
        !          1168: .Ip %o 8
        !          1169: Organization (yours).
        !          1170: .Ip %O 8
        !          1171: Original working directory (where you ran rn from).
        !          1172: .Ip %p 8
        !          1173: Your private news directory, normally ~/News.
        !          1174: .Ip %P 8
        !          1175: Public news spool directory, normally /usr/spool/news.
        !          1176: .Ip %r 8
        !          1177: Last reference on references line of current article (parent article id).
        !          1178: .Ip %R 8
        !          1179: References list for a new article, constructed from the references and article
        !          1180: ID of the current article.
        !          1181: .Ip %s 8
        !          1182: Subject, with all Re's and (nf)'s stripped off.
        !          1183: .Ip %S 8
        !          1184: Subject, with one \*(L"Re:\*(R" stripped off.
        !          1185: .Ip %t 8
        !          1186: \*(L"To:\*(R" line derived from the \*(L"From:\*(R" and \*(L"Reply-To:\*(R"
        !          1187: lines of the current article.
        !          1188: This always returns an Internet format address.
        !          1189: .Ip %T 8
        !          1190: \*(L"To:\*(R" line derived from the \*(L"Path:\*(R" line of the
        !          1191: current article to produce a uucp path.
        !          1192: .Ip %u 8
        !          1193: The number of unread articles in the current newsgroup.
        !          1194: .Ip %U 8
        !          1195: The number of unread articles in the current newsgroup, not counting the
        !          1196: current article.
        !          1197: .Ip %x 8
        !          1198: The news library directory.
        !          1199: .Ip %X 8
        !          1200: The rn library directory.
        !          1201: .Ip %z 8
        !          1202: The length of the current article in bytes.
        !          1203: .Ip %~ 8
        !          1204: Your home directory.
        !          1205: .Ip %. 8
        !          1206: The directory containing your dot files, which is your home directory unless
        !          1207: the environment variable DOTDIR is defined when rn is invoked.
        !          1208: .Ip %$ 8
        !          1209: Current process number.
        !          1210: .Ip %/ 8
        !          1211: Last search string.
        !          1212: .Ip %% 8
        !          1213: A percent sign.
        !          1214: .Ip "%{name} or %{name\-default}" 8
        !          1215: The environment variable \*(L"name\*(R".
        !          1216: .Ip %[name] 8
        !          1217: The value of header line \*(L"Name:\*(R" from the current article.
        !          1218: The \*(L"Name:\ \*(R" is not included.
        !          1219: For example \*(L"%D\*(R" and \*(L"%[distribution]\*(R" are equivalent.
        !          1220: The name must be spelled out in full.
        !          1221: .Ip %`command` 8
        !          1222: Inserts the output of the command, with any embedded newlines translated
        !          1223: to space.
        !          1224: .Ip %""prompt"" 8
        !          1225: Prints prompt on the terminal, then inputs one string, and inserts it.
        !          1226: .Ip "%(test_text=pattern?then_text:else_text)" 8
        !          1227: If
        !          1228: .I test_text
        !          1229: matches
        !          1230: .IR pattern ,
        !          1231: has the value
        !          1232: .IR then_text ,
        !          1233: otherwise
        !          1234: .IR else_text .
        !          1235: The \*(L":else_text\*(R" is optional, and if absent, interpolates the null string.
        !          1236: The = may be replaced with != to negate the test.
        !          1237: To quote any of the metacharacters
        !          1238: (\*(L'=\*(R', \*(L'?\*(R', \*(L':\*(R', or \*(L')\*(R'),
        !          1239: precede with a backslash.
        !          1240: .Ip %digit 8
        !          1241: The digits 1 through 9 interpolate the string matched by the nth bracket
        !          1242: in the last pattern match that had brackets.
        !          1243: If the last pattern had alternatives, you may not know the number of the
        !          1244: bracket you want\*(--%0 will give you the last bracket matched.
        !          1245: .PP
        !          1246: Modifiers: to capitalize the first letter, insert \*(L'^\*(R':
        !          1247: \*(L"%^C\*(R" produces something like \*(L"Net.jokes\*(R".
        !          1248: Inserting \*(L'_\*(R' causes the first letter following the last
        !          1249: \&\*(L'/\*(R' to be capitalized: \*(L"%_c\*(R" produces \*(L"net/Jokes\*(R".
        !          1250: .SH ENVIRONMENT
        !          1251: The following environment variables are paid attention to by
        !          1252: .IR rn .
        !          1253: In general the default values assumed for these variables by
        !          1254: .I rn
        !          1255: are reasonable, so if you are using
        !          1256: .I rn
        !          1257: for the first time, you can safely ignore this section.
        !          1258: Note that the defaults below may not correspond precisely to the defaults
        !          1259: on your system.
        !          1260: To find the actual defaults you would need to look in config.h and common.h
        !          1261: in the rn source directory, and the file INIT in the rn library.
        !          1262: .PP
        !          1263: Those variables marked (%) are subject to % interpolation, and those marked
        !          1264: (~) are subject to both % interpolation and ~ interpretation.
        !          1265: .Ip "ATTRIBUTION (%)" 8
        !          1266: Gives the format of the attribution line in front of the quoted article
        !          1267: included by an F command.
        !          1268: .Sp
        !          1269: Default: In article %i %f writes:
        !          1270: .Ip "CANCEL (~)" 8
        !          1271: The shell command used to cancel an article.
        !          1272: .Sp
        !          1273: Default: inews \-h < %h
        !          1274: .Ip "CANCELHEADER (%)" 8 13v
        !          1275: The format of the file to pass to the CANCEL command in order to cancel
        !          1276: an article.
        !          1277: .Sp
        !          1278: Default:
        !          1279: .br
        !          1280: Newsgroups: %n
        !          1281: .br
        !          1282: Subject: cmsg cancel %i
        !          1283: .br
        !          1284: References: %R
        !          1285: .br
        !          1286: Reply-To: %L@%H.UUCP (%N)
        !          1287: .br
        !          1288: Distribution: %D
        !          1289: .br
        !          1290: Organization: %o
        !          1291: .sp 1
        !          1292: %i cancelled from rn.
        !          1293: .Ip DOTDIR 8
        !          1294: Where to find your dot files, if they aren't in your home directory.
        !          1295: Can be interpolated using \*(L"%.\*(R".
        !          1296: .Sp
        !          1297: Default: $HOME
        !          1298: .Ip "EDITOR (~)" 8
        !          1299: The name of your editor, if VISUAL is undefined.
        !          1300: .Sp
        !          1301: Default: whatever your news administrator compiled in, usually vi.
        !          1302: .Ip "FIRSTLINE (%)" 8
        !          1303: Controls the format of the line displayed at the top of an article.
        !          1304: Warning: this may go away.
        !          1305: .Sp
        !          1306: Default: Article %a %(%U%M!=^00$?(%U more%(%M!=^0$? + %M Marked to return)\e) )in %C:, more or less.
        !          1307: .Ip HIDELINE 8
        !          1308: If defined, contains a regular expression which matches article lines to
        !          1309: be hidden, in order, for instance, to suppress quoted material.
        !          1310: A recommended string for this purpose is \*(L"^>...\*(R", which \fIdoesn't\fR
        !          1311: hide lines with only \*(L'>\*(R', to give some indication that quoted
        !          1312: material is being skipped.
        !          1313: If you want to hide more than one pattern, you can use \*(L"\||\|\*(R" to
        !          1314: separate the alternatives.
        !          1315: You can view the hidden lines by restarting the article with the \*(L'v\*(R'
        !          1316: command.
        !          1317: .Sp
        !          1318: There is some overhead involved in matching each line of the article against
        !          1319: a regular expression.
        !          1320: You might wish to use a baud-rate modifier to enable this feature only at
        !          1321: low baud rates.
        !          1322: .Sp
        !          1323: Default: undefined
        !          1324: .Ip HOME 8
        !          1325: Your home directory.
        !          1326: Affects ~ interpretation, and the location of your
        !          1327: dot files if DOTDIR is not defined.
        !          1328: .Sp
        !          1329: Default: $LOGDIR
        !          1330: .Ip "KILLGLOBAL (~)" 8
        !          1331: Where to find the KILL file to apply to every newsgroup.
        !          1332: See the \*(L'^K\*(R' command at the newsgroup selection level.
        !          1333: .Sp
        !          1334: Default: %p/KILL
        !          1335: .Ip "KILLLOCAL (~)" 8
        !          1336: Where to find the KILL file for the current newsgroup.
        !          1337: See the commands \*(L'K\*(R' and \*(L'^K\*(R' at the article selection level,
        !          1338: and the search modifier \*(L'K\*(R'.
        !          1339: .Sp
        !          1340: Default: %p/%c/KILL
        !          1341: .Ip LOGDIR 8
        !          1342: Your home directory if HOME is undefined.
        !          1343: Affects ~ interpretation, and the location of your
        !          1344: dot files if DOTDIR is not defined.
        !          1345: .Sp
        !          1346: Default: none.
        !          1347: .Sp
        !          1348: Explanation: you must have either $HOME or $LOGDIR.
        !          1349: .Ip LOGNAME 8
        !          1350: Your login name, if USER is undefined.
        !          1351: May be interpolated using \*(L"%L\*(R".
        !          1352: .Sp
        !          1353: Default: value of getlogin().
        !          1354: .Ip "MAILCALL (~)" 8
        !          1355: What to say when there is new mail.
        !          1356: .Sp
        !          1357: Default: (Mail)
        !          1358: .Ip "MAILFILE (~)" 8
        !          1359: Where to check for mail.
        !          1360: .Sp
        !          1361: Default: /usr/spool/mail/%L
        !          1362: .Ip "MAILHEADER (%)" 8
        !          1363: The format of the header file for replies.
        !          1364: See also MAILPOSTER.
        !          1365: .Sp
        !          1366: Default:
        !          1367: .Sp
        !          1368: To: %T
        !          1369: .br
        !          1370: Subject: %(%i=^$?:Re: %S
        !          1371: .br
        !          1372: Newsgroups: %n
        !          1373: .br
        !          1374: In-Reply-To: %i)
        !          1375: .br
        !          1376: %(%[references]!=^$?References\\: %[references]
        !          1377: .br
        !          1378: )Organization: %o
        !          1379: .br
        !          1380: Cc: 
        !          1381: .br
        !          1382: Bcc: \en\en
        !          1383: .Ip "MAILPOSTER (~)" 8
        !          1384: The shell command to be used by the reply commands (r and R)
        !          1385: in order to allow you to enter and deliver the response.
        !          1386: .I Rn
        !          1387: will not itself call upon an editor for replies\*(--this
        !          1388: is a function of the program called by
        !          1389: .IR rn .
        !          1390: See also MAILHEADER.
        !          1391: .Sp
        !          1392: Default: Rnmail \-h %h
        !          1393: .Ip "MBOXSAVER (~)" 8
        !          1394: The shell command to save an article in mailbox format.
        !          1395: .Sp
        !          1396: Default: %X/mbox.saver %A %P %c %a %B %C "%b" \e
        !          1397: .br
        !          1398: "From: %T %`date`"
        !          1399: .Sp
        !          1400: Explanation: the first seven arguments are the same as for NORMSAVER.
        !          1401: The eighth argument to the shell script is the new From: line
        !          1402: for the article, including the posting date,
        !          1403: derived either directly from the Posted: line, or not-so-directly from
        !          1404: the Date: line.
        !          1405: Header munging at its finest.
        !          1406: .Ip NAME 8
        !          1407: Your full name.
        !          1408: May be interpolated using \*(L"%N\*(R".
        !          1409: .Sp
        !          1410: Default: name from /etc/passwd, or ~/.fullname.
        !          1411: .Ip "NEWSHEADER (%)" 8 16v
        !          1412: The format of the header file for followups.
        !          1413: See also NEWSPOSTER.
        !          1414: .Sp
        !          1415: Default:
        !          1416: .Sp
        !          1417: Newsgroups: %(%F=^$?%C:%F)
        !          1418: .br
        !          1419: Subject: %(%S=^$?%"\n\nSubject: ":Re: %S)
        !          1420: .br
        !          1421: Summary:
        !          1422: .br
        !          1423: Expires: 
        !          1424: .br
        !          1425: %(%R=^$?:References: %R
        !          1426: .br
        !          1427: )Sender: 
        !          1428: .br
        !          1429: Reply-To: %L@%H.UUCP (%N)
        !          1430: .br
        !          1431: Followup-To: 
        !          1432: .br
        !          1433: Distribution: %(%i=^$?%"\nDistribution: ":%D)
        !          1434: .br
        !          1435: Organization: %o
        !          1436: .br
        !          1437: Keywords: \en\en
        !          1438: .Ip "NEWSPOSTER (~)" 8
        !          1439: The shell command to be used by the followup commands (f and F)
        !          1440: in order to allow you to enter and post a followup news article.
        !          1441: .I Rn
        !          1442: will not itself call upon an editor for followups\*(--this
        !          1443: is a function of the program called by
        !          1444: .IR rn .
        !          1445: See also NEWSHEADER.
        !          1446: .Sp
        !          1447: Default: Pnews \-h %h
        !          1448: .Ip "NORMSAVER (~)" 8
        !          1449: The shell command to save an article in the normal (non-mailbox) format.
        !          1450: .Sp
        !          1451: Default: %X/norm.saver %A %P %c %a %B %C "%b"
        !          1452: .Ip ORGANIZATION 8
        !          1453: Either the name of your organization, or the name of a file containing the
        !          1454: name of your organization.
        !          1455: May be interpolated using \*(L"%o\*(R".
        !          1456: .Sp
        !          1457: Default: whatever your news administrator compiled in.
        !          1458: .Ip PAGESTOP 8
        !          1459: If defined, contains a regular expression which matches article lines to
        !          1460: be treated as form-feeds.
        !          1461: There are at least two things you might want to do with this.
        !          1462: To cause page breaks between articles in a digest, you might define it
        !          1463: as \*(L"^--------\*(R".
        !          1464: To force a page break before a signature, you could define it
        !          1465: as \*(L"^-- $\*(R".
        !          1466: (Then, when you see \*(L"--\*(R" at the bottom of the page, you can skip
        !          1467: the signature if you so desire by typing \*(L'n\*(R' instead of space.)
        !          1468: To do both, you could use \*(L"^--\*(R".
        !          1469: If you want to break on more than one pattern, you can use \*(L"\||\|\*(R" to
        !          1470: separate the alternatives.
        !          1471: .Sp
        !          1472: There is some overhead involved in matching each line of the article against
        !          1473: a regular expression.
        !          1474: You might wish to use a baud-rate modifier to enable this feature only at
        !          1475: low baud rates.
        !          1476: .Sp
        !          1477: Default: undefined
        !          1478: .Ip "PIPESAVER (%)" 8
        !          1479: The shell command to execute in order to accomplish a save to a pipe
        !          1480: (\*(L"s\ |\ command\*(R" or \*(L"w\ |\ command\*(R").
        !          1481: The command typed by the user is substituted in as %b.
        !          1482: .Sp
        !          1483: Default: %(%B=^0$?<%A:tail +%Bc %A |) %b
        !          1484: .Sp
        !          1485: Explanation: if %B is 0, the command is \*(L"<%A %b\*(R", otherwise
        !          1486: the command is \*(L"tail +%Bc %A | %b\*(R".
        !          1487: .Ip RNINIT 8
        !          1488: Default values for switches may be passed to
        !          1489: .I rn
        !          1490: by placing them in RNINIT.
        !          1491: Any switch that is set in RNINIT may be overruled 
        !          1492: on the command line, or via the \*(L'&\*(R' command from within
        !          1493: .IR rn .
        !          1494: Binary-valued switches that are set with \*(L"\-switch\*(R" may be unset
        !          1495: using \*(L"+switch\*(R".
        !          1496: .Sp
        !          1497: If RNINIT begins with a \*(L'/\*(R' it is assumed to be the name of a file
        !          1498: containing switches.
        !          1499: If you want to set many environment variables but don't want to keep
        !          1500: them all in your environment, or if the use of any of these variables
        !          1501: conflicts with other programs, you can use this feature along with the
        !          1502: .B \-E
        !          1503: switch to set the environment variables upon startup.
        !          1504: .Sp
        !          1505: Default: \*(L" \*(R".
        !          1506: .Ip "RNMACRO (~)" 8
        !          1507: The name of the file containing macros and key mappings.
        !          1508: See the MACROS section.
        !          1509: .Sp
        !          1510: Default: %./.rnmac
        !          1511: .Ip "SAVEDIR (~)" 8
        !          1512: The name of the directory to save to, if the save command does not specify
        !          1513: a directory name.
        !          1514: .Sp
        !          1515: Default:
        !          1516: .br
        !          1517:    If
        !          1518: .B \-/
        !          1519: is set: %p/%c
        !          1520: .br
        !          1521:    If
        !          1522: .B +/
        !          1523: is set: %p
        !          1524: .Ip "SAVENAME (%)" 8
        !          1525: The name of the file to save to, if the save command contains only a
        !          1526: directory name.
        !          1527: .Sp
        !          1528: Default:
        !          1529: .br
        !          1530:    If
        !          1531: .B \-/
        !          1532: is set: %a
        !          1533: .br
        !          1534:    If
        !          1535: .B +/
        !          1536: is set: %^C
        !          1537: .Ip SHELL 8
        !          1538: The name of your preferred shell.
        !          1539: It will be used by the \*(L'!\*(R', \*(L'S\*(R' and \*(L'W\*(R' commands.
        !          1540: .Sp
        !          1541: Default: whatever your news administrator compiled in.
        !          1542: .Ip "SUBJLINE (%)" 8
        !          1543: Controls the format of the lines displayed by the \*(L'=\*(R' command at
        !          1544: the article selection level.
        !          1545: .Sp
        !          1546: Default: %s
        !          1547: .Ip TERM 8
        !          1548: Determines which termcap entry to use, unless TERMCAP contains the entry.
        !          1549: .Ip TERMCAP 8
        !          1550: Holds either the name of your termcap file, or a termcap entry.
        !          1551: .Sp
        !          1552: Default: /etc/termcap, normally.
        !          1553: .Ip USER 8
        !          1554: Your login name.
        !          1555: May be interpolated using \*(L"%L\*(R".
        !          1556: .Sp
        !          1557: Default: $LOGNAME
        !          1558: .Ip "VISUAL (~)" 8
        !          1559: The name of your editor.
        !          1560: .Sp
        !          1561: Default: $EDITOR
        !          1562: .Ip "YOUSAID (%)" 8
        !          1563: Gives the format of the attribution line in front of the quoted article
        !          1564: included by an R command.
        !          1565: .Sp
        !          1566: Default: In article %i you write:
        !          1567: .SH MACROS
        !          1568: When
        !          1569: .I rn
        !          1570: starts up, it looks for a file containing macro definitions (see environment
        !          1571: variable RNMACRO).
        !          1572: Any sequence of commands may be bound to any sequence of keys, so you
        !          1573: could remap your entire keyboard if you desire.
        !          1574: Blank lines or lines beginning with # in the macro file are considered
        !          1575: comments; otherwise
        !          1576: .I rn
        !          1577: looks for two fields separated by white space.
        !          1578: The first field gives the sequence of keystrokes that trigger the macro,
        !          1579: and the second field gives the sequence of commands to execute.
        !          1580: Both fields are subject to % interpolation, which will also translate
        !          1581: backslash and uparrow sequences.
        !          1582: (The keystroke field is interpreted at startup time, but the command field
        !          1583: is interpreted at macro execution time so that you may refer to % values
        !          1584: in a macro.)
        !          1585: For example, if you want to reverse the roles of carriage return and
        !          1586: space in rn
        !          1587: .Sp
        !          1588: ^J     \e040
        !          1589: .br
        !          1590: ^M     \e040
        !          1591: .br
        !          1592: \e040  ^J
        !          1593: .Sp
        !          1594: will do just that.
        !          1595: By default, all characters in the command field are interpreted as the
        !          1596: canonical
        !          1597: .I rn
        !          1598: characters, i.e. no macro expansion is done.
        !          1599: Otherwise the above pair of macros would cause an infinite loop.
        !          1600: To force macro expansion in the command field, enclose the
        !          1601: macro call with ^( ... ^) thusly:
        !          1602: .Sp
        !          1603: @s     |mysavescript
        !          1604: .br
        !          1605: @w     w^(@s^)
        !          1606: .Sp
        !          1607: You can use the %() conditional construct to construct macros that work
        !          1608: differently under different circumstances.
        !          1609: In particular, the current mode (%m) of
        !          1610: .I rn
        !          1611: could be used to make a command that only works at a particular level.
        !          1612: For example,
        !          1613: .Sp
        !          1614: ^[[O   %(%m=p?\e040)
        !          1615: .Sp
        !          1616: will only allow the macro to work at the pager level.
        !          1617: .Sp
        !          1618: %(%{TERM}=vt100?^[[O)  /^J
        !          1619: .Sp
        !          1620: will do the binding only if the terminal type is vt100,
        !          1621: though if you have many of these it would be better to have separate
        !          1622: files for each terminal.
        !          1623: .Sp
        !          1624: If you want to bind a macro to a function key that puts a common garbage character
        !          1625: after the sequence (such as the carriage return on the end of Televideo 920
        !          1626: function sequences), DO NOT put the carriage return
        !          1627: into all the sequences or you will waste a CONSIDERABLE amount of internal
        !          1628: storage.
        !          1629: Instead of \*(L"^AF^M\*(R", put \*(L"^AF+1\*(R", which indicates to
        !          1630: .I rn
        !          1631: that it should gobble up one character after the F.
        !          1632: .SH AUTHOR
        !          1633: Larry Wall <[email protected]>
        !          1634: .br
        !          1635: Regular expression routines are borrowed from emacs, by James Gosling.
        !          1636: .SH FILES
        !          1637: .Ip "%./.newsrc" 1.25i
        !          1638: status of your news reading
        !          1639: .Ip "%./.oldnewsrc" 1.25i
        !          1640: backup copy of your
        !          1641: .I .newsrc
        !          1642: from start of session
        !          1643: .Ip "%./.rnlock" 1.25i
        !          1644: lock file so you don't screw up your
        !          1645: .I .newsrc
        !          1646: .Ip "%./.rnlast" 1.25i
        !          1647: info from last run of rn
        !          1648: .Ip "%./.rnsoft" 1.25i
        !          1649: soft pointers into /usr/lib/active to speed startup, synchronous with
        !          1650: .I .newsrc
        !          1651: .Ip "%./.rnhead" 1.25i
        !          1652: temporary header file to pass to a mailer or news poster
        !          1653: .Ip "%./.rnmac" 1.25i
        !          1654: macro and keymap definitions
        !          1655: .Ip "%p" 1.25i
        !          1656: your news save directory, usually ~/News
        !          1657: .Ip "%x/active" 1.25i
        !          1658: the list of active newsgroups, usually /usr/lib/news/active
        !          1659: .Ip "%P" 1.25i
        !          1660: the public news spool directory, usually /usr/spool/news
        !          1661: .Ip "%X/INIT" 1.25i
        !          1662: system-wide default switches
        !          1663: .SH SEE ALSO
        !          1664: newsrc(5), more(1), readnews(1), Pnews(1), Rnmail(1)
        !          1665: .SH DIAGNOSTICS
        !          1666: Generally self-documenting, as they say.
        !          1667: .SH BUGS
        !          1668: The
        !          1669: .B \-h
        !          1670: switch can only hide header lines that
        !          1671: .I rn
        !          1672: knows about.
        !          1673: .PP
        !          1674: The \*(L'\-\*(R' command doesn't cross newsgroup boundaries, and only undoes
        !          1675: the last article selection.
        !          1676: .PP
        !          1677: If you edit your
        !          1678: .I .newsrc
        !          1679: while
        !          1680: .I rn
        !          1681: is running,
        !          1682: .I rn
        !          1683: will happily wipe out your changes when it decides to
        !          1684: write out the
        !          1685: .I .newsrc
        !          1686: file.
        !          1687: .PP
        !          1688: .I Rn
        !          1689: doesn't do certain things (like ordering articles on posting date) that
        !          1690: the author feels should be handled by inews.
        !          1691: .PP
        !          1692: Marking of duplicate articles as read in cross-referenced newsgroups will
        !          1693: not work unless the Xref patch is installed in inews.
        !          1694: .PP
        !          1695: If you get carried away with % or escape substitutions, you can overflow
        !          1696: buffers.
        !          1697: .PP
        !          1698: There should be no fixed limit on the number of newsgroups.
        !          1699: .PP
        !          1700: Some of the more esoteric features may be missing on machines with limited
        !          1701: address space.

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