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Annotation of lucent/sys/man/1/sam, revision 1.1

1.1     ! root        1: .TH SAM 1
        !             2: .ds a \fR*\ \fP
        !             3: .SH NAME
        !             4: sam, B, sam.save \- screen editor with structural regular expressions 
        !             5: .SH SYNOPSIS
        !             6: .B sam
        !             7: [
        !             8: .I option ...
        !             9: ] [
        !            10: .I files
        !            11: ]
        !            12: .PP
        !            13: .B sam
        !            14: .B -r
        !            15: .I machine
        !            16: .PP
        !            17: .B sam.save
        !            18: .PP
        !            19: .B B
        !            20: [
        !            21: .BI -nnnn
        !            22: ]
        !            23: .I file ...
        !            24: .SH DESCRIPTION
        !            25: .I Sam
        !            26: is a multi-file editor.
        !            27: It modifies a local copy of an external file.
        !            28: The copy is here called a
        !            29: .IR file .
        !            30: The files are listed in a menu available through mouse button 3
        !            31: or the
        !            32: .B n
        !            33: command.
        !            34: Each file has an associated name, usually the name of the
        !            35: external file from which it was read, and a `modified' bit that indicates whether
        !            36: the editor's file agrees with the external file.
        !            37: The external file is not read into
        !            38: the editor's file until it first becomes the current file\(emthat to
        !            39: which editing commands apply\(emwhereupon its menu entry is printed.
        !            40: The options are
        !            41: .TF -rmachine
        !            42: .TP
        !            43: .B -d
        !            44: Do not `download' the terminal part of
        !            45: .IR sam .
        !            46: Editing will be done with the command language only, as in
        !            47: .IR ed (1).
        !            48: .TP
        !            49: .BI -r " machine
        !            50: Run the host part remotely
        !            51: on the specified machine, the terminal part locally.
        !            52: .TP
        !            53: .BI -s " path
        !            54: Start the host part from the specified file on the remote host.
        !            55: Only meaningful with the
        !            56: .BI -r
        !            57: option.
        !            58: .TP
        !            59: .BI -t " path
        !            60: Start the terminal part from the specified file.  Useful
        !            61: for debugging.
        !            62: .PD
        !            63: .SS Regular expressions
        !            64: Regular expressions are as in
        !            65: .IR regexp (6)
        !            66: with the addition of
        !            67: .BR \en
        !            68: to represent newlines.
        !            69: A regular expression may never contain a literal newline character.
        !            70: The empty
        !            71: regular expression stands for the last complete expression encountered.
        !            72: A regular expression in
        !            73: .I sam
        !            74: matches the longest leftmost substring formally
        !            75: matched by the expression.
        !            76: Searching in the reverse direction is equivalent
        !            77: to searching backwards with the catenation operations reversed in
        !            78: the expression.
        !            79: .SS Addresses
        !            80: An address identifies a substring in a file.
        !            81: In the following, `character
        !            82: .IR n '
        !            83: means the null string
        !            84: after the
        !            85: .IR n -th
        !            86: character in the file, with 1 the
        !            87: first character in the file.
        !            88: `Line
        !            89: .IR n '
        !            90: means the
        !            91: .IR n -th
        !            92: match,
        !            93: starting at the beginning of the file, of the regular expression
        !            94: .LR .*\en? .
        !            95: All files always have a current substring, called dot,
        !            96: that is the default address.
        !            97: .SS Simple Addresses
        !            98: .PD0
        !            99: .TP
        !           100: .BI # n
        !           101: The empty string after character
        !           102: .IR n ;
        !           103: .B #0
        !           104: is the beginning of the file.
        !           105: .TP
        !           106: .I n
        !           107: Line
        !           108: .IR n ;
        !           109: .B 0
        !           110: is the beginning of the file.
        !           111: .TP
        !           112: .BI  / regexp /
        !           113: .PD0
        !           114: .TP
        !           115: .BI ? regexp ?
        !           116: The substring that matches the regular expression,
        !           117: found by looking toward the end 
        !           118: .RB ( / )
        !           119: or beginning
        !           120: .RB ( ? )
        !           121: of the file,
        !           122: and if necessary continuing the search from the other end to the
        !           123: starting point of the search.
        !           124: The matched substring may straddle
        !           125: the starting point.
        !           126: When entering a pattern containing a literal question mark
        !           127: for a backward search, the question mark should be
        !           128: specified as a member of a class.
        !           129: .PD
        !           130: .TP
        !           131: .B 0
        !           132: The string before the first full line.
        !           133: This is not necessarily
        !           134: the null string; see
        !           135: .B +
        !           136: and
        !           137: .B -
        !           138: below.
        !           139: .TP
        !           140: .B $
        !           141: The null string at the end of the file.
        !           142: .TP
        !           143: .B .
        !           144: Dot.
        !           145: .TP
        !           146: .B \&'
        !           147: The mark in the file (see the
        !           148: .B k
        !           149: command below).
        !           150: .TP
        !           151: \fL"\f2regexp\fL"\f1\f1
        !           152: Preceding a simple address (default
        !           153: .BR . ),
        !           154: refers to the address evaluated in the unique file whose menu line
        !           155: matches the regular expression.
        !           156: .PD
        !           157: .SS Compound Addresses
        !           158: In the following,
        !           159: .I a1
        !           160: and
        !           161: .I a2
        !           162: are addresses.
        !           163: .TF a1+a2
        !           164: .TP
        !           165: .IB a1 + a2
        !           166: The address
        !           167: .I a2
        !           168: evaluated starting at the end of
        !           169: .IR a1 .
        !           170: .TP
        !           171: .IB a1 - a2
        !           172: The address
        !           173: .I a2
        !           174: evaluated looking in the reverse direction
        !           175: starting at the beginning of
        !           176: .IR a1 .
        !           177: .TP
        !           178: .IB a1 , a2
        !           179: The substring from the beginning of
        !           180: .I a1
        !           181: to the end of
        !           182: .IR a2 .
        !           183: If
        !           184: .I a1
        !           185: is missing,
        !           186: .B 0
        !           187: is substituted.
        !           188: If
        !           189: .I a2
        !           190: is missing,
        !           191: .B $
        !           192: is substituted.
        !           193: .TP
        !           194: .IB  a1 ; a2
        !           195: Like
        !           196: .IB a1 , a2\f1,
        !           197: but with
        !           198: .I a2
        !           199: evaluated at the end of, and dot set to,
        !           200: .IR a1 .
        !           201: .PD
        !           202: .PP
        !           203: The operators
        !           204: .B +
        !           205: and
        !           206: .B -
        !           207: are high precedence, while
        !           208: .B ,
        !           209: and
        !           210: .B ;
        !           211: are low precedence.
        !           212: .PP
        !           213: In both
        !           214: .B +
        !           215: and
        !           216: .B -
        !           217: forms, if
        !           218: .I a2
        !           219: is a line or character address with a missing
        !           220: number, the number defaults to 1.
        !           221: If
        !           222: .I a1
        !           223: is missing,
        !           224: .L .
        !           225: is substituted.
        !           226: If both
        !           227: .I a1
        !           228: and
        !           229: .I a2
        !           230: are present and distinguishable,
        !           231: .B +
        !           232: may be elided.
        !           233: .I a2
        !           234: may be a regular
        !           235: expression; if it is delimited by
        !           236: .LR ? 's,
        !           237: the effect of the
        !           238: .B +
        !           239: or
        !           240: .B -
        !           241: is reversed.
        !           242: .PP
        !           243: It is an error for a compound address to represent a malformed substring.
        !           244: Some useful idioms: 
        !           245: .IB a1 +-
        !           246: \%(\f2a1\fL-+\f1)
        !           247: selects the line containing
        !           248: the end (beginning) of a1.
        !           249: .BI 0/ regexp /
        !           250: locates the first match of the expression in the file.
        !           251: (The form
        !           252: .B 0;//
        !           253: sets dot unnecessarily.)
        !           254: .BI ./ regexp /// 
        !           255: finds the second following occurrence of the expression,
        !           256: and
        !           257: .BI .,/ regexp /
        !           258: extends dot.
        !           259: .SS Commands
        !           260: In the following, text demarcated by slashes represents text delimited
        !           261: by any printable
        !           262: character except alphanumerics.
        !           263: Any number of
        !           264: trailing delimiters may be elided, with multiple elisions then representing
        !           265: null strings, but the first delimiter must always
        !           266: be present.
        !           267: In any delimited text,
        !           268: newline may not appear literally;
        !           269: .B \en
        !           270: may be typed for newline; and
        !           271: .B \e/
        !           272: quotes the delimiter, here 
        !           273: .LR / .
        !           274: Backslash is otherwise interpreted literally, except in
        !           275: .B s
        !           276: commands.
        !           277: .PP
        !           278: Most commands may be prefixed by an address to indicate their range
        !           279: of operation.
        !           280: Those that may not are marked with a 
        !           281: .L *
        !           282: below.
        !           283: If a command takes
        !           284: an address and none is supplied, dot is used.
        !           285: The sole exception is
        !           286: the
        !           287: .B w
        !           288: command, which defaults to
        !           289: .BR 0,$ .
        !           290: In the description, `range' is used
        !           291: to represent whatever address is supplied.
        !           292: Many commands set the
        !           293: value of dot as a side effect.
        !           294: If so, it is always set to the `result'
        !           295: of the change: the empty string for a deletion, the new text for an
        !           296: insertion, etc. (but see the
        !           297: .B s
        !           298: and
        !           299: .B e
        !           300: commands).
        !           301: .br
        !           302: .ne 1.2i
        !           303: .SS Text commands
        !           304: .PD0
        !           305: .TP
        !           306: .BI a/ text /
        !           307: .TP
        !           308: or
        !           309: .TP
        !           310: .B  a
        !           311: .TP
        !           312: .I lines of text
        !           313: .TP
        !           314: .B .
        !           315: Insert the text into the file after the range.
        !           316: Set dot.
        !           317: .PD
        !           318: .TP
        !           319: .B c\fP
        !           320: .br
        !           321: .ns
        !           322: .TP
        !           323: .B i\fP
        !           324: Same as
        !           325: .BR a ,
        !           326: but
        !           327: .B c
        !           328: replaces the text, while
        !           329: .B i
        !           330: inserts
        !           331: .I before
        !           332: the range.
        !           333: .TP
        !           334: .B d
        !           335: Delete the text in the range.
        !           336: Set dot.
        !           337: .TP
        !           338: .BI s/ regexp / text /
        !           339: Substitute
        !           340: .I text
        !           341: for the first match to the regular expression in the range.
        !           342: Set dot to the modified range.
        !           343: In 
        !           344: .I text
        !           345: the character
        !           346: .B &
        !           347: stands for the string
        !           348: that matched the expression. 
        !           349: Backslash behaves as usual unless followed by
        !           350: a digit:
        !           351: .BI \e d
        !           352: stands for the string that matched the
        !           353: subexpression begun by the
        !           354: .IR d -th
        !           355: left parenthesis.
        !           356: If
        !           357: .I s
        !           358: is followed immediately by a
        !           359: number
        !           360: .IR n ,
        !           361: as in
        !           362: .BR s2/x/y/ ,
        !           363: the
        !           364: .IR n -th
        !           365: match in the range is substituted.
        !           366: If the
        !           367: command is followed by a
        !           368: .BR g ,
        !           369: as in
        !           370: .BR s/x/y/g ,
        !           371: all matches in the range
        !           372: are substituted.
        !           373: .TP
        !           374: .BI m " a1
        !           375: .br
        !           376: .ns
        !           377: .TP
        !           378: .BI t " a1
        !           379: Move
        !           380: .RB ( m )
        !           381: or copy
        !           382: .RB ( t )
        !           383: the range to after
        !           384: .IR a1 .
        !           385: Set dot.
        !           386: .SS Display commands
        !           387: .PD 0
        !           388: .TP
        !           389: .B p
        !           390: Print the text in the range.
        !           391: Set dot.
        !           392: .TP
        !           393: .B =
        !           394: Print the line address and character address of the range.
        !           395: .TP
        !           396: .B =#
        !           397: Print just the character address of the range.
        !           398: .PD
        !           399: .SS File commands
        !           400: .PD0
        !           401: .TP
        !           402: .BI \*ab " file-list
        !           403: Set the current file to the first file named in the list
        !           404: that
        !           405: .I sam
        !           406: also has in its menu.
        !           407: The list may be expressed
        !           408: .BI < "Plan 9 command"
        !           409: in which case the file names are taken as words (in the shell sense)
        !           410: generated by the Plan 9 command.
        !           411: .TP
        !           412: .BI \*aB " file-list
        !           413: Same as
        !           414: .BR b ,
        !           415: except that file names not in the menu are entered there,
        !           416: and all file names in the list are examined.
        !           417: .TP
        !           418: .B \*an
        !           419: Print a menu of files.
        !           420: The format is:
        !           421: .RS
        !           422: .TP 11
        !           423: .BR ' " or blank
        !           424: indicating the file is modified or clean,
        !           425: .TP 11
        !           426: .BR - " or \&" +
        !           427: indicating the file is unread or has been read
        !           428: (in the terminal,
        !           429: .B *
        !           430: means more than one window is open),
        !           431: .TP 11
        !           432: .BR . " or blank
        !           433: indicating the current file,
        !           434: .TP 11
        !           435: a blank,
        !           436: .TP 11
        !           437: and the file name.
        !           438: .RE
        !           439: .TP 0
        !           440: .BI \*aD " file-list
        !           441: Delete the named files from the menu.
        !           442: If no files are named, the current file is deleted.
        !           443: It is an error to
        !           444: .B D
        !           445: a modified file, but a subsequent
        !           446: .B D
        !           447: will delete such a file.
        !           448: .PD
        !           449: .SS I/O Commands
        !           450: .PD0
        !           451: .TP
        !           452: .BI \*ae " filename
        !           453: Replace the file by the contents of the named external file.
        !           454: Set dot to the beginning of the file.
        !           455: .TP
        !           456: .BI r " filename
        !           457: Replace the text in the range by the contents of the named external file.
        !           458: Set dot.
        !           459: .TP
        !           460: .BI w " filename
        !           461: Write the range (default
        !           462: .BR 0,$ )
        !           463: to the named external file.
        !           464: .TP
        !           465: .BI \*af " filename
        !           466: Set the file name and print the resulting menu entry.
        !           467: .PP
        !           468: If the file name is absent from any of these, the current file name is used.
        !           469: .B e
        !           470: always sets the file name;
        !           471: .B r
        !           472: and
        !           473: .B w
        !           474: do so if the file has no name.
        !           475: .TP
        !           476: .BI < " Plan 9-command
        !           477: Replace the range by the standard output of the
        !           478: Plan 9 command.
        !           479: .TP
        !           480: .BI > " Plan 9-command
        !           481: Send the range to the standard input of the
        !           482: Plan 9 command.
        !           483: .TP
        !           484: .BI | " Plan 9-command
        !           485: Send the range to the standard input, and replace it by
        !           486: the standard output, of the
        !           487: Plan 9 command.
        !           488: .TP
        !           489: .BI \*a! " Plan 9-command
        !           490: Run the
        !           491: Plan 9 command.
        !           492: .TP
        !           493: .BI \*acd " directory
        !           494: Change working directory.
        !           495: If no directory is specified,
        !           496: .B $home
        !           497: is used.
        !           498: .PD
        !           499: .PP
        !           500: In any of
        !           501: .BR < ,
        !           502: .BR > ,
        !           503: .B |
        !           504: or
        !           505: .BR ! ,
        !           506: if the
        !           507: .I Plan 9 command
        !           508: is omitted the last
        !           509: .I Plan 9 command
        !           510: (of any type) is substituted.
        !           511: If
        !           512: .I sam
        !           513: is
        !           514: .I downloaded
        !           515: (using the mouse and bitmap display, i.e. not using option
        !           516: .BR -d ),
        !           517: .B !
        !           518: sets standard input to
        !           519: .BR /dev/null ,
        !           520: and otherwise
        !           521: unassigned output
        !           522: .RB ( stdout
        !           523: for
        !           524: .B !
        !           525: and
        !           526: .BR > ,
        !           527: .B stderr
        !           528: for all) is placed in
        !           529: .B /tmp/sam.err
        !           530: and the first few lines are printed.
        !           531: .SS Loops and Conditionals
        !           532: .PD0
        !           533: .TP
        !           534: .BI x/ regexp / " command
        !           535: For each match of the regular expression in the range, run the command
        !           536: with dot set to the match.
        !           537: Set dot to the last match.
        !           538: If the regular
        !           539: expression and its slashes are omitted, 
        !           540: .L /.*\en/
        !           541: is assumed.
        !           542: Null string matches potentially occur before every character
        !           543: of the range and at the end of the range.
        !           544: .TP
        !           545: .BI y/ regexp / " command
        !           546: Like
        !           547: .BR x ,
        !           548: but run the command for each substring that lies before, between,
        !           549: or after
        !           550: the matches that would be generated by
        !           551: .BR x .
        !           552: There is no default regular expression.
        !           553: Null substrings potentially occur before every character
        !           554: in the range.
        !           555: .TP
        !           556: .BI \*aX/ regexp / " command
        !           557: For each file whose menu entry matches the regular expression,
        !           558: make that the current file and
        !           559: run the command.
        !           560: If the expression is omitted, the command is run
        !           561: in every file.
        !           562: .TP
        !           563: .BI \*aY/ regexp / " command
        !           564: Same as
        !           565: .BR X ,
        !           566: but for files that do not match the regular expression,
        !           567: and the expression is required.
        !           568: .TP
        !           569: .BI g/ regexp / " command
        !           570: .br
        !           571: .ns
        !           572: .TP
        !           573: .BI v/ regexp / " command
        !           574: If the range contains
        !           575: .RB ( g )
        !           576: or does not contain
        !           577: .RB ( v )
        !           578: a match for the expression,
        !           579: set dot to the range and run the command.
        !           580: .PP
        !           581: These may be nested arbitrarily deeply, but only one instance of either
        !           582: .B X
        !           583: or
        !           584: .B Y
        !           585: may appear in a \%single command.
        !           586: An empty command in an
        !           587: .B x
        !           588: or
        !           589: .B y
        !           590: defaults to
        !           591: .BR p ;
        !           592: an empty command in
        !           593: .B X
        !           594: or
        !           595: .B Y
        !           596: defaults to
        !           597: .BR f .
        !           598: .B g
        !           599: and
        !           600: .B v
        !           601: do not have defaults.
        !           602: .PD
        !           603: .SS Miscellany
        !           604: .TF (empty)
        !           605: .TP
        !           606: .B k
        !           607: Set the current file's mark to the range.  Does not set dot.
        !           608: .TP
        !           609: .B \*aq
        !           610: Quit.
        !           611: It is an error to quit with modified files, but a second
        !           612: .B q
        !           613: will succeed.
        !           614: .TP
        !           615: .BI \*au " n
        !           616: Undo the last
        !           617: .I n
        !           618: (default 1)
        !           619: top-level commands that changed the contents or name of the
        !           620: current file, and any other file whose most recent change was simultaneous
        !           621: with the current file's change.
        !           622: Successive
        !           623: .BR u 's
        !           624: move further back in time.
        !           625: The only commands for which u is ineffective are
        !           626: .BR cd ,
        !           627: .BR u ,
        !           628: .BR q ,
        !           629: .B w
        !           630: and
        !           631: .BR D .
        !           632: .TP
        !           633: (empty)
        !           634: If the range is explicit, set dot to the range.
        !           635: If
        !           636: .I sam
        !           637: is downloaded, the resulting dot is selected on the screen;
        !           638: otherwise it is printed.
        !           639: If no address is specified (the
        !           640: command is a newline) dot is extended in either direction to
        !           641: line boundaries and printed.
        !           642: If dot is thereby unchanged, it is set to
        !           643: .B .+1 
        !           644: and printed.
        !           645: .PD
        !           646: .SS Grouping and multiple changes
        !           647: Commands may be grouped by enclosing them in braces
        !           648: .BR {} .
        !           649: Commands within the braces must appear on separate lines (no backslashes are
        !           650: required between commands).
        !           651: Semantically, an opening brace is like a command:
        !           652: it takes an (optional) address and sets dot for each sub-command.
        !           653: Commands within the braces are executed sequentially, but changes made
        !           654: by one command are not visible to other commands (see the next
        !           655: paragraph).
        !           656: Braces may be nested arbitrarily.
        !           657: .PP
        !           658: When a command makes a number of changes to a file, as in
        !           659: .BR x/re/c/text/ ,
        !           660: the addresses of all changes to the file are computed in the original file.
        !           661: If the changes are in sequence,
        !           662: they are applied to the file.
        !           663: Successive insertions at the same address are catenated into a single
        !           664: insertion composed of the several insertions in the order applied.
        !           665: .SS The terminal
        !           666: What follows refers to behavior of
        !           667: .I sam
        !           668: when downloaded, that is, when
        !           669: operating as a display editor on a bitmap display.
        !           670: This is the default
        !           671: behavior; invoking
        !           672: .I sam
        !           673: with the
        !           674: .B -d
        !           675: (no download) option provides access
        !           676: to the command language only.
        !           677: .PP
        !           678: Each file may have zero or more windows open.
        !           679: Each window is equivalent
        !           680: and is updated simultaneously with changes in other windows on the same file.
        !           681: Each window has an independent value of dot, indicated by a highlighted
        !           682: substring on the display.
        !           683: Dot may be in a region not within
        !           684: the window.
        !           685: There is usually a `current window',
        !           686: marked with a dark border, to which typed text and editing
        !           687: commands apply.
        !           688: Text may be typed and edited as in
        !           689: .IR 8½ (1);
        !           690: also the escape key (ESC) selects (sets dot to) text typed
        !           691: since the last mouse button hit.
        !           692: .PP
        !           693: The button 3 menu controls window operations.
        !           694: The top of the menu
        !           695: provides the following operators, each of which uses one or
        !           696: more
        !           697: .IR 8½ -like
        !           698: cursors to prompt for selection of a window or sweeping
        !           699: of a rectangle.
        !           700: `Sweeping' a null rectangle gets a large window, disjoint
        !           701: from the command window or the whole screen, depending on
        !           702: where the null rectangle is.
        !           703: .TF reshape
        !           704: .TP 
        !           705: .B new
        !           706: Create a new, empty file.
        !           707: .TP
        !           708: .B zerox
        !           709: Create a copy of an existing window.
        !           710: .TP
        !           711: .B reshape
        !           712: As in
        !           713: .IR 8½ .
        !           714: .TP
        !           715: .B close
        !           716: Delete the window.
        !           717: In the last window of a file,
        !           718: .B close
        !           719: is equivalent to a
        !           720: .B D
        !           721: for the file.
        !           722: .TP
        !           723: .B write
        !           724: Equivalent to a
        !           725: .B w
        !           726: for the file.
        !           727: .PD
        !           728: .PP
        !           729: Below these operators is a list of available files, starting with
        !           730: .BR ~~sam~~ ,
        !           731: the command window.
        !           732: Selecting a file from the list makes the most recently
        !           733: used window on that file current, unless it is already current, in which
        !           734: case selections cycle through the open windows.
        !           735: If no windows are open
        !           736: on the file, the user is prompted to open one.
        !           737: Files other than
        !           738: .B ~~sam~~
        !           739: are marked with one of the characters
        !           740: .B -+*
        !           741: according as zero, one, or more windows
        !           742: are open on the file.
        !           743: A further mark
        !           744: .L .
        !           745: appears on the file in the current window and
        !           746: a single quote,
        !           747: .BR ' ,
        !           748: on a file modified since last write.
        !           749: .PP
        !           750: The command window, created automatically when
        !           751: .B sam
        !           752: starts, is an ordinary window except that text typed to it
        !           753: is interpreted as commands for the editor rather than passive text,
        !           754: and text printed by editor commands appears in it.
        !           755: The behavior is like
        !           756: .IR 8½ ,
        !           757: with an `output point' that separates commands being typed from
        !           758: previous output.
        !           759: Commands typed in the command window apply to the
        !           760: current open file\(emthe file in the most recently
        !           761: current window.
        !           762: .SS Manipulating text
        !           763: Button 1 changes selection, much like
        !           764: .IR 8½ .
        !           765: Pointing to a non-current window with button 1 makes it current;
        !           766: within the current window, button 1 selects text, thus setting dot.
        !           767: Double-clicking selects text to the boundaries of words, lines,
        !           768: quoted strings or bracketed strings, depending on the text at the click.
        !           769: .PP
        !           770: Button 2 provides a menu of editing commands:
        !           771: .TF /regexp
        !           772: .TP
        !           773: .B cut
        !           774: Delete dot and save the deleted text in the snarf buffer.
        !           775: .TP
        !           776: .B paste
        !           777: Replace the text in dot by the contents of the snarf buffer.
        !           778: .TP
        !           779: .B snarf
        !           780: Save the text in dot in the snarf buffer.
        !           781: .TP
        !           782: .B look
        !           783: Search forward for the next occurrence of the literal text in dot.
        !           784: If dot is the null string, the text in the snarf buffer is
        !           785: used.
        !           786: The snarf buffer is unaffected.
        !           787: .TP
        !           788: .B <8½>
        !           789: Exchange snarf buffers with
        !           790: .IR 8½ .
        !           791: .TP
        !           792: .BI / regexp
        !           793: Search forward for the next match of the last regular expression
        !           794: typed in a command.
        !           795: (Not in command window.)
        !           796: .TP
        !           797: .B send
        !           798: Send the text in dot, or the snarf buffer if
        !           799: dot is the null string, as if it were typed to the command window.
        !           800: Saves the sent text in the snarf buffer.
        !           801: (Command window only.) 
        !           802: .PD
        !           803: .SS External communication
        !           804: On invocation
        !           805: .I sam
        !           806: creates a named pipe
        !           807: .BI /srv/sam. user
        !           808: which acts as an additional source of commands.  Characters written to
        !           809: the named pipe are treated as if they had been typed in the command window.
        !           810: This is usually used to issue
        !           811: .B B
        !           812: commands from the shell.
        !           813: .PP
        !           814: .I B
        !           815: is a shell-level command that causes an instance of
        !           816: .I sam
        !           817: running on the same terminal to load the named
        !           818: .IR files .
        !           819: The option allows a line number to be specified for
        !           820: the initial position to display in the last named file.
        !           821: .SS Abnormal termination
        !           822: If
        !           823: .I sam
        !           824: terminates other than by a
        !           825: .B q
        !           826: command (by hangup, deleting its window, etc.), modified
        !           827: files are saved in an
        !           828: executable file,
        !           829: .BR $home/sam.save .
        !           830: This program, when executed, asks whether to write
        !           831: each file back to a external file.
        !           832: The answer
        !           833: .L y
        !           834: causes writing; anything else skips the file.
        !           835: .SH FILES
        !           836: .TF /sys/src/cmd/samterm
        !           837: .TP
        !           838: .B $home/sam.save
        !           839: .TP
        !           840: .B $home/sam.err
        !           841: .TP
        !           842: .B /sys/lib/samsave
        !           843: the program called to unpack
        !           844: .BR $home/sam.save .
        !           845: .SH SOURCE
        !           846: .TF /sys/src/cmd/samterm
        !           847: .TP
        !           848: .B /sys/src/cmd/sam
        !           849: source for
        !           850: .I sam
        !           851: itself
        !           852: .TP
        !           853: .B /sys/src/cmd/samterm
        !           854: source for the separate terminal part
        !           855: .TP
        !           856: .B /rc/bin/B
        !           857: .SH SEE ALSO
        !           858: .IR ed (1),
        !           859: .IR sed (1),
        !           860: .IR grep (1),
        !           861: .IR 8½ (1),
        !           862: .IR regexp (6).
        !           863: .PP
        !           864: Rob Pike,
        !           865: ``The text editor sam''.

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