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Annotation of 43BSDReno/share/doc/usd/24.troff/m0a, revision 1.1

1.1     ! root        1: .\"    @(#)m0a 6.2 (Berkeley) 4/21/86
        !             2: .\"
        !             3: .pn3
        !             4: .br
        !             5: .tr |
        !             6: .ce
        !             7: .ftB
        !             8: SUMMARY OF REQUESTS AND OUTLINE OF THIS MANUAL
        !             9: .ftR
        !            10: .de mx
        !            11: .ev2
        !            12: .nf
        !            13: .h1
        !            14: .in
        !            15: .sp
        !            16: .fi
        !            17: .ev
        !            18: .ns
        !            19: ..
        !            20: .xx
        !            21: .h1 \s-1#\s+1 *
        !            22: .fn
        !            23: .sp.3
        !            24: *Values separated by "\fB;\fR" are for \*(NR and \*(TR respectively.
        !            25: .sp.2
        !            26: \s-1#\s+1Notes are explained at the end of this Summary and Index
        !            27: .ef
        !            28: .mh
        !            29: General Explanation
        !            30: .mh
        !            31: Font and Character Size Control
        !            32: .bt
        !            33: \fB&ps\fI\|\(+-N\fR    10\|point       previous        E       Point size; also \fB\es\fI\(+-N\fR.\(dg
        !            34: .b1
        !            35: \fB&fz\fI|F|\(+-N\fR   off     -       E       font \fIF\fR to point size \fI\(+-N\fR.
        !            36: .b1
        !            37: \fB&fz|S|\fIF|\(+-N\fR off     -       E       Special Font characters to point size \fI\(+-N\fR.
        !            38: .b1
        !            39: \fB&ss\fI|N\fR 12\(sl36\|em    ignored E       Space-character size
        !            40: set to \fIN\fR\(sl36\|em.\(dg
        !            41: .b1
        !            42: \fB&cs\fI|F\|N\|M\fR   off     -       P       Constant character
        !            43: space (width)
        !            44: mode (font \fIF\^\fR\^).\(dg
        !            45: .b1
        !            46: \fB&bd\fI|F|N\fR       off     -       P       Embolden font \fIF\fR by \fIN\fR\(mi1 units.\(dg
        !            47: .b1
        !            48: \fB&bd|S|\fIF|N\fR     off     -       P       Embolden Special Font when current font is \fIF\fR.\(dg
        !            49: .fn
        !            50: .sp.2
        !            51: \(dgNo effect in \*(NR.
        !            52: .ef
        !            53: .b1
        !            54: \fB&ft\fI|F\fR Roman   previous        E       Change to font
        !            55: \fIF\fR|= \fIx\fR, \fIxx\fR, or 1-4.
        !            56: Also \fB\ef\fIx\fR,\|\fB\ef(\fIxx\fR,\|\fB\ef\fIN\fR.
        !            57: .b1
        !            58: \fB&fp\fI|N|F\fR       R,I,B,S ignored -       Font named \fIF\fR mounted on physical position 1\(<=\fIN\fR\(<=4.
        !            59: .mh
        !            60: Page Control
        !            61: .bt
        !            62: \fB&pl\fI|\(+-N\fR     11\|in  11\|in  \fBv\fR Page length.
        !            63: .b1
        !            64: \fB&bp|\fI\(+-N\fR     \fIN\(eq\fR1    -       B\(dd,\fBv\fR   \
        !            65: Eject current page; next page number \fIN\fR.
        !            66: .fn
        !            67: .sp.2
        !            68: \(ddThe use of "\ \fB\'\fR\ " as control character (instead of "\fB.\fR")
        !            69: suppresses the break function.
        !            70: .ef
        !            71: .b1
        !            72: \fB&pn\fI|\(+-N        N\(eq\fR1       ignored -       Next page number \fIN\fR.
        !            73: .b1
        !            74: \fB&po\fI|\(+-N\fR     0;|26\(sl27\|in previous        \fBv\fR Page offset.
        !            75: .b1
        !            76: \fB&ne\fI|N\fR -       \fIN\(eq\fR1\fIV\fR     D,\fBv\fR       Need \fIN\fR vertical space (\fIV\fR = vertical spacing).
        !            77: .b1
        !            78: \fB&mk|\fIR\fR none    internal        D       Mark current vertical place in register \fIR\fR.
        !            79: .b1
        !            80: \fB&rt\fI|\(+-N\fR     none    internal        D,\fBv\fR       Return \fI(upward only)\fR to marked vertical place.
        !            81: .mh
        !            82: Text Filling, Adjusting, and Centering
        !            83: .bt
        !            84: \fB&br\fR      -       -       B       Break.
        !            85: .b1
        !            86: .lg0
        !            87: \fB&fi\fR      \(fill  -       B,E     Fill output lines.
        !            88: .lg
        !            89: .b1
        !            90: \fB&nf\fR      fill    -       B,E     No filling or adjusting of output lines.
        !            91: .b1
        !            92: \fB&ad\fI|c\fR adj,both        adjust  E       Adjust output lines with mode \fIc\fR.
        !            93: .b1
        !            94: \fB&na\fR      adjust  -       E       No output line adjusting.
        !            95: .b1
        !            96: \fB&ce\fI|N\fR off     \fIN\(eq\fR1    B,E     Center following \fIN\fR input text lines.
        !            97: .mh
        !            98: Vertical Spacing
        !            99: .bt
        !           100: \fB&vs\fI|N\fR 1\(sl6in;12pts  previous        E,\fBp\fR       Vertical base line spacing (\fIV\fR\^).
        !           101: .b1
        !           102: \fB&ls\fI|N    N\(eq\fR1       previous        E       Output \fIN\(mi\fR1 \fIV\^\fRs after each text output line.
        !           103: .b1
        !           104: \fB&sp\fI|N\fR -       \fIN\(eq\fR1\fIV\fR     B,\fBv\fR       Space \
        !           105: vertical distance \fIN\fR \fIin either direction\fR.
        !           106: .b1
        !           107: \fB&sv\fI|N\fR -       \fIN\(eq\fR1\fIV\fR     \fBv\fR Save vertical distance \fIN\fR.
        !           108: .b1
        !           109: \fB&os\fR      -       -       -       Output saved vertical distance.
        !           110: .b1
        !           111: \fB&ns\fR      space   -       D       Turn no-space mode on.
        !           112: .b1
        !           113: \fB&rs\fR      -       -       D       Restore spacing; turn no-space mode off.
        !           114: .mh
        !           115: Line Length and Indenting
        !           116: .bt
        !           117: \fB&ll\fI|\(+-N\fR     6.5\|in previous        E,\fBm\fR       Line length.
        !           118: .b1
        !           119: \fB&in\fI|\(+-N\fR     \fIN\(eq\fR\^0  previous        B,E,\fBm\fR     Indent.
        !           120: .b1
        !           121: \fB&ti\fI|\(+-N\fR     -       ignored B,E,\fBm\fR     Temporary indent.
        !           122: .mh
        !           123: Macros, Strings, Diversion, and Position Traps
        !           124: .bt
        !           125: \fB&de\fI|xx|yy\fR     -       \fI.yy=\fB..\fR -       Define or redefine macro \fIxx;\fR end at call of \fIyy\fR.
        !           126: .b1
        !           127: \fB&am\fI|xx|yy\fR     -       \fI.yy=\fB..\fR -       Append to a macro.
        !           128: .b1
        !           129: \fB&ds\fI|xx|string\fR -       ignored -       Define a string \fIxx\fR containing \fIstring\fR.
        !           130: .b1
        !           131: \fB&as\fI|xx|string\fR -       ignored -       Append \fIstring\fR to string \fIxx\fR.
        !           132: .b1
        !           133: \fB&rm\fI|xx\fR        -       ignored -       Remove request, macro, or string.
        !           134: .b1
        !           135: \fB&rn\fI|xx|yy\fR     -       ignored -       Rename request, macro, or string \fIxx\fR to \fIyy\fR.
        !           136: .b1
        !           137: \fB&di\fI|xx\fR        -       end     D       Divert output to macro \fIxx\fR.
        !           138: .b1
        !           139: \fB&da\fI|xx\fR        -       end     D       Divert and append to \fIxx\fR.
        !           140: .b1
        !           141: \fB&wh\fI|N|xx\fR      -       -       \fBv\fR Set location trap; negative is w.r.t. page bottom.
        !           142: .b1
        !           143: \fB&ch\fI|xx|N\fR      -       -       \fBv\fR Change trap location.
        !           144: .b1
        !           145: \fB&dt\fI|N|xx\fR      -       off     D,\fBv\fR       Set a diversion trap.
        !           146: .b1
        !           147: \fB&it\fI|N|xx\fR      -       off     E       Set an input-line count trap.
        !           148: .b1
        !           149: \fB&em\fI|xx\fR        none    none    -       End macro is \fIxx\fI.
        !           150: .mh
        !           151: Number Registers
        !           152: .bt
        !           153: \fB&nr\fI|R|\(+-N|M\fR -       -       \fBu\fR Define and set number register \fIR\fR; auto-increment by \fIM\fR.
        !           154: .b1
        !           155: \fB&af\fI|R|c\fR       arabic  -       -       Assign format to register \fIR\fR (\fIc=\fB1\fR, \fBi\fR, \fBI\fR, \fBa\fR, \fBA\fR).
        !           156: .b1
        !           157: \fB&rr\fI|R\fR -       -       -       Remove register \fIR\fR.
        !           158: .mh
        !           159: Tabs, Leaders, and Fields
        !           160: .bt
        !           161: \fB&ta\fI|Nt|...\fR    0.8;|0.5in      none    E,\fBm\fR       Tab settings; \fIleft\fR type, unless \fIt=\fBR\fR(right), \fBC\fR(centered).
        !           162: .b1
        !           163: \fB&tc\fI|c\fR none    none    E       Tab repetition character.
        !           164: .b1
        !           165: \fB&lc\fI|c\fR \fB.\fR none    E       Leader repetition character.
        !           166: .b1
        !           167: \fB&fc\fI|a|b\fR       off     off     -       Set field delimiter \fIa\fR and pad character \fIb\fR.
        !           168: .mh
        !           169: Input and Output Conventions and Character Translations
        !           170: .bt
        !           171: \fB&ec\fI|c\fR \e      \e      -       Set escape character.
        !           172: .b1
        !           173: \fB&eo\fR      on      -       -       Turn off escape character mechanism.
        !           174: .b1
        !           175: \fB&lg\fI|N\fR -;\|on  on      -       Ligature mode
        !           176: on if \fIN\fR>0.
        !           177: .b1
        !           178: \fB&ul\fI|N\fR off     \fIN\(eq\fR1    E       Underline (italicize in \*(TR) \fIN\fR input lines.
        !           179: .b1
        !           180: \fB&cu\fI|N\fR off     \fIN\(eq\fR1    E       Continuous underline in \*(NR; like \fBul\fR in \*(TR.
        !           181: .b1
        !           182: \fB&uf\fI|F\fR Italic  Italic  -       Underline font set to \fIF\fR (to be switched to by \fBul\fR).
        !           183: .b1
        !           184: \fB&cc\fI|c\fR \fB.    .\fR    E       Set control character to \fIc\fR.
        !           185: .b1
        !           186: \fB&c2\fI|c\fR \fB\'   \'\fR   E       Set nobreak control character to \fIc\fR.
        !           187: .b1
        !           188: \fB&tr\fI|abcd....\fR  none    -       O       Translate \fIa\fR to \fIb\fR, etc. on output.
        !           189: .mh
        !           190: Local Horizontal and Vertical Motions, and the Width Function
        !           191: .mh
        !           192: Overstrike, Bracket, Line-drawing, and Zero-width Functions
        !           193: .mh
        !           194: Hyphenation.
        !           195: .bt
        !           196: \fB&nh\fR      hyphenate       -       E       No hyphenation.
        !           197: .b1
        !           198: \fB&hy\fI|N\fR hyphenate       hyphenate       E       Hyphenate; \fIN =\fR mode.
        !           199: .b1
        !           200: \fB&hc\fI|c\fR \fB\e%  \e%\fR  E       Hyphenation indicator character \fIc\fR.
        !           201: .b1
        !           202: \fB&hw\fI|word1|...\fR         ignored -       Exception words.
        !           203: .mh
        !           204: Three Part Titles.
        !           205: .bt
        !           206: \fB&tl\fI|\'left\|\'center\|\'right\|\'\fR     -       -       Three part title.
        !           207: .b1
        !           208: \fB&pc\fI|c\fR \fB%\fR off     -       Page number character.
        !           209: .b1
        !           210: \fB&lt\fI|\(+-N\fR     6.5\|in previous        E,\fBm\fR       Length of title.
        !           211: .mh
        !           212: Output Line Numbering.
        !           213: .bt
        !           214: \fB&nm\fI|\(+-N|M|S|I\fR       off     E       Number mode on or off, set parameters.
        !           215: .b1
        !           216: \fB&nn\fI|N\fR -       \fIN\(eq\fR1    E       Do not number next \fIN\fR lines.
        !           217: .mh
        !           218: Conditional Acceptance of Input
        !           219: .bt
        !           220: \fB&if\fI|c|anything\fR        -       -       If condition \fIc\fR true, accept \fIanything\fR as input,
        !           221: .b1
        !           222:                                for multi-line use \fI\e{anything\|\e}\fR.
        !           223: .b1
        !           224: \fB&if|!\fIc|anything\fR       -       -       If condition \fIc\fR false, accept \fIanything\fR.
        !           225: .b1
        !           226: \fB&if\fI|N|anything\fR        -       \fBu\fR If expression \fIN\fR > 0, accept \fIanything\fR.
        !           227: .b1
        !           228: \fB&if|!\fIN|anything\fR       -       \fBu\fR If expression \fIN\fR \(<= 0, accept \fIanything\fR.
        !           229: .b1
        !           230: \fB&if\fI|\|\'string1\|\'string2\|\'|anything\fR       -       If \fIstring1\fR identical to \fIstring2\fR,
        !           231: accept \fIanything\fR.
        !           232: .b1
        !           233: \fB&if|!\fI\|\'string1\|\'string2\|\'|anything\fR      -       If \fIstring1\fR not identical to \fIstring2\fR,
        !           234: accept \fIanything\fR.
        !           235: .b1
        !           236: \fB&ie\fI|c|anything\fR        -       \fBu\fR If portion of if-else; all above forms (like \fBif\fR).
        !           237: .b1
        !           238: \fB&el\fI|anything\fR          -       -       Else portion of if-else.
        !           239: .mh
        !           240: Environment Switching.
        !           241: .bt
        !           242: \fB&ev\fI|N\fR \fIN\(eq\fR0    previous        -       Environment switched (\fIpush down\fR).
        !           243: .mh
        !           244: Insertions from the Standard Input
        !           245: .bt
        !           246: \fB&rd\fI|prompt\fR\fR -       \fIprompt=\s-1\fRBEL\s+1        Read insertion.
        !           247: .b1
        !           248: \fB&ex\fR      -       -       -       \
        !           249: Exit from \*(NR\(sl\*(TR.
        !           250: .mh
        !           251: Input\(slOutput File Switching
        !           252: .bt
        !           253: \fB&so\fI|filename\fR          -       -       Switch source file \fI(push down)\fR.
        !           254: .b1
        !           255: \fB&nx\fI|filename\fR          end-of-file     -       Next file.
        !           256: .b1
        !           257: \fB&pi\fI|program\fR           -       -       Pipe output to \fIprogram\fR (\*(NR only).
        !           258: .mh
        !           259: Miscellaneous
        !           260: .bt
        !           261: \fB&mc\fI|c|N\fR       -       off     E,\fBm\fR       Set margin character \fIc\fR and separation \fIN\fR.
        !           262: .b1
        !           263: \fB&tm\fI|string\fR    -       newline -       Print \fIstring\fR on terminal \
        !           264: (\s-1UNIX\s+1 standard error output).
        !           265: .b1
        !           266: \fB&ig\fI|yy\fR        -       \fI.yy=\fB..\fR -       Ignore till call of \fIyy\fR.
        !           267: .b1
        !           268: \fB&pm\fI|t\fR -       all     -       Print macro names and sizes;
        !           269: .b1
        !           270:                                if \fIt\fR present, print only total of sizes.
        !           271: .b1
        !           272: \fB&ab\fI|string\fR    -       -       -       Print a message and abort.
        !           273: .b1
        !           274: .lg0
        !           275: \fB&fl\fR      -       -       B       Flush output buffer.
        !           276: .lg
        !           277: .mh
        !           278: Output and Error Messages
        !           279: .xx
        !           280: .nf
        !           281: .rm mx
        !           282: .ftR
        !           283: \l'\n(.lu'
        !           284: .ftB
        !           285: .xx
        !           286: .ta .3iC .6i
        !           287:        Notes-
        !           288: .xx
        !           289: .ftR
        !           290:        B       Request normally causes a break.
        !           291:        D       Mode or relevant parameters associated with current diversion level.
        !           292:        E       Relevant parameters are a part of the current environment.
        !           293:        O       Must stay in effect until logical output.
        !           294:        P       Mode must be still or again in effect at the time of physical output.
        !           295:        \fBv\fR,\fBp\fR,\fBm\fR,\fBu\fR Default scale indicator; if not specified, scale indicators are \fIignored\fR.
        !           296: .br
        !           297: .nr zz 11
        !           298: .de cl
        !           299: .ie \\n+(cl<\n(zz \{\
        !           300: .      po +\\n(.lu/\n(zzu
        !           301: .      rt\}
        !           302: .el \{.po 26i/27u\}
        !           303: ..
        !           304: .nr cl 0 1
        !           305: .di zz
        !           306: .ta .3iR
        !           307: .nf
        !           308: .ps 8
        !           309: .vs 10
        !           310: ab     20
        !           311: ad     4
        !           312: af     8
        !           313: am     7
        !           314: as     7
        !           315: bd     2
        !           316: bp     3
        !           317: br     4
        !           318: c2     10
        !           319: cc     10
        !           320: ce     4
        !           321: ch     7
        !           322: cs     2
        !           323: cu     10
        !           324: da     7
        !           325: de     7
        !           326: di     7
        !           327: ds     7
        !           328: dt     7
        !           329: ec     10
        !           330: el     16
        !           331: em     7
        !           332: eo     10
        !           333: ev     17
        !           334: ex     18
        !           335: fc     9
        !           336: fi     4
        !           337: fl     20
        !           338: fp     2
        !           339: ft     2
        !           340: fz     2
        !           341: hc     13
        !           342: hw     13
        !           343: hy     13
        !           344: ie     16
        !           345: if     16
        !           346: ig     20
        !           347: in     6
        !           348: it     7
        !           349: lc     9
        !           350: lg     10
        !           351: li     10
        !           352: ll     6
        !           353: ls     5
        !           354: lt     14
        !           355: mc     20
        !           356: mk     3
        !           357: na     4
        !           358: ne     3
        !           359: nf     4
        !           360: nh     13
        !           361: nm     15
        !           362: nn     15
        !           363: nr     8
        !           364: ns     5
        !           365: nx     19
        !           366: os     5
        !           367: pc     14
        !           368: pi     19
        !           369: pl     3
        !           370: pm     20
        !           371: pn     3
        !           372: po     3
        !           373: ps     2
        !           374: rd     18
        !           375: rm     7
        !           376: rn     7
        !           377: rr     8
        !           378: rs     5
        !           379: rt     3
        !           380: so     19
        !           381: sp     5
        !           382: ss     2
        !           383: sv     5
        !           384: ta     9
        !           385: tc     9
        !           386: ti     6
        !           387: tl     14
        !           388: tm     20
        !           389: tr     10
        !           390: uf     10
        !           391: ul     10
        !           392: vs     5
        !           393: wh     7
        !           394: .di
        !           395: .nr aa \n(dn/\n(zz
        !           396: .ne \\n(aau+10p
        !           397: .sp
        !           398: .ftB
        !           399: Alphabetical Request and Section Number Cross Reference
        !           400: .ft
        !           401: .sp.3
        !           402: .wh \n(nlu+\n(aau cl
        !           403: .nr qq \n(nlu+\n(aau
        !           404: .ps
        !           405: .vs
        !           406: .mk
        !           407: .zz
        !           408: .rt
        !           409: .sp \n(.tu
        !           410: .ch cl 12i
        !           411: .sp
        !           412: .bp
        !           413: .nf
        !           414: .ftB
        !           415: Escape Sequences for Characters, Indicators, and Functions
        !           416: .ftR
        !           417: .xx
        !           418: .TS
        !           419: c2l
        !           420: c2l2l
        !           421: n2l2l.
        !           422: .ftI
        !           423: .bd I 3
        !           424: Section        Escape
        !           425: Reference      Sequence        Meaning
        !           426: .ftR
        !           427: .bd I
        !           428: .xx
        !           429: 10.1   \fB\e\e\fR      \e (to prevent or delay the interpretation of \e\|)
        !           430: 10.1   \fB\ee\fR       Printable version of the \fIcurrent\fR escape character.
        !           431: 2.1    \fB\e\'\fR      \' (acute accent); equivalent to \fB\e(aa\fR
        !           432: 2.1    \fB\e\`\fR      \` (grave accent); equivalent to \fB\e(ga\fR
        !           433: 2.1    \fB\e\-\fR      \- Minus sign in the \fIcurrent\fR font
        !           434: 7      \fB\e\^.\fR     Period (dot) (see \fBde\fR)
        !           435: 11.1   \fB\e\fR(space) Unpaddable space-size space character
        !           436: 11.1   \fB\e0\fR       Digit width space
        !           437: .tr ||
        !           438: 11.1   \fB\e\||\fR     1\(sl6\|em narrow space character (zero width in \*(NR)
        !           439: .tr |
        !           440: 11.1   \fB\e^\fR       1\(sl12\|em half-narrow space character (zero width in \*(NR)
        !           441: .tr &&
        !           442: 4.1    \fB\e&\fR       Non-printing, zero width character
        !           443: .tr &.
        !           444: 10.6   \fB\e!\fR       Transparent line indicator
        !           445: 10.7   \fB\e"\fR       Beginning of comment
        !           446: 7.3    \fB\e$\fIN\fR   Interpolate argument 1\(<=\fIN\fR\(<=9
        !           447: 13     \fB\e%\fR       Default optional hyphenation character
        !           448: 2.1    \fB\e(\fIxx\fR  Character named \fIxx\fR
        !           449: 7.1    \fB\e\(**\fIx\fR,|\fB\e\(**(\fIxx\fR    Interpolate string \fIx\fR or \fIxx\fR
        !           450: 9.1    \fB\ea\fR       Non-interpreted leader character
        !           451: 12.3   \fB\eb\fI\'abc...\|\'\fR        Bracket building function
        !           452: 4.2    \fB\ec\fR       Interrupt text processing
        !           453: 11.1   \fB\ed\fR       Forward (down) 1\(sl2\|em vertical motion (1\(sl2 line in \*(NR)
        !           454: 2.2    \fB\ef\fIx\fR,\fB\ef(\fIxx\fR,\fB\ef\fIN\fR     Change to font named \fIx\fR or \fIxx\fR, or position \fIN\fR
        !           455: 11.1   \fB\eh\fI\'N|\'\fR      Local horizontal motion; move right \fIN\fR \fI(negative left)\fR
        !           456: 11.3   \fB\ek\fIx\fR   Mark horizontal \fIinput\fR place in register \fIx\fR
        !           457: 12.4   \fB\el\fI\|\'Nc\|\'\fR  Horizontal line drawing function (optionally with \fIc\fR\|)
        !           458: 12.4   \fB\eL\fI\'Nc\|\'\fR    Vertical line drawing function (optionally with \fIc\fR\|)
        !           459: 8      \fB\en\fIx\fR,\fB\en(\fIxx\fR   Interpolate number register \fIx\fR or \fIxx\fR
        !           460: 12.1   \fB\eo\fI\'abc...\|\'\fR        Overstrike characters \fIa, b, c, ...\fR
        !           461: 4.1    \fB\ep\fR       Break and spread output line
        !           462: 11.1   \fB\er\fR       Reverse 1\|em vertical motion (reverse line in \*(NR)
        !           463: 2.3    \fB\es\fIN\fR,\|\fB\es\fI\(+-N\fR       Point-size change function
        !           464: 9.1    \fB\et\fR       Non-interpreted horizontal tab
        !           465: 11.1   \fB\eu\fR       Reverse (up) 1\(sl2\|em vertical motion (1\(sl2 line in \*(NR)
        !           466: 11.1   \fB\ev\fI\'N\|\|\'\fR   Local vertical motion; move down \fIN\fR \fI(negative up)\fR
        !           467: 11.2   \fB\ew\fI\'string\|\'\fR        Interpolate width of \fIstring\fR
        !           468: 5.2    \fB\ex\fI\'N\|\|\'\fR   Extra line-space function \fI(negative before, positive after)\fR
        !           469: 12.2   \fB\ez\fIc\fR   Print \fIc\fR with zero width (without spacing)
        !           470: 16     \fB\e{\fR       Begin conditional input
        !           471: 16     \fB\e}\fR       End conditional input
        !           472: 10.7   \fB\e\fR(newline)       Concealed (ignored) newline
        !           473: -      \fB\e\fIX\fR    \fIX\fR, any character \fInot\fR listed above
        !           474: .TE
        !           475: .fi
        !           476: .sp
        !           477: The escape sequences
        !           478: \fB\e\e\fR,
        !           479: \fB\e\^.\fR,
        !           480: \fB\e"\fR,
        !           481: \fB\e$\fR,
        !           482: \fB\e\(**\fR,
        !           483: \fB\ea\fR,
        !           484: \fB\en\fR,
        !           485: \fB\et\fR,
        !           486: and
        !           487: \fB\e\fR(newline) are interpreted in \fIcopy mode\fR (\(sc7.2).
        !           488: .bp
        !           489: .ftB
        !           490: .nf
        !           491: Predefined General Number Registers
        !           492: .ft
        !           493: .TS
        !           494: c2l
        !           495: c2l2l
        !           496: n2l2l.
        !           497: .ftI
        !           498: .bd I 3
        !           499: Section        Register
        !           500: Reference      Name    Description
        !           501: .ftR
        !           502: .bd I
        !           503: .xx
        !           504: 3      \fB%\fR Current page number.
        !           505: 19     \fBc&\fR        Number of \fIlines\fR read from current input file.
        !           506: 11.2   \fBct\fR        Character type (set by \fIwidth\fR function).
        !           507: 7.4    \fBdl\fR        Width (maximum) of last completed diversion.
        !           508: 7.4    \fBdn\fR        Height (vertical size) of last completed diversion.
        !           509: -      \fBdw\fR        Current day of the week (1-7).
        !           510: -      \fBdy\fR        Current day of the month (1-31).
        !           511: 11.3   \fBhp\fR        Current horizontal place on \fIinput\fR line (not in ditroff)
        !           512: 15     \fBln\fR        Output line number.
        !           513: -      \fBmo\fR        Current month (1-12).
        !           514: 4.1    \fBnl\fR        Vertical position of last printed text base-line.
        !           515: 11.2   \fBsb\fR        Depth of string below base line (generated by \fIwidth\fR function).
        !           516: 11.2   \fBst\fR        Height of string above base line (generated by \fIwidth\fR function).
        !           517: -      \fByr\fR        Last two digits of current year.
        !           518: .TE
        !           519: .sp
        !           520: .ftB
        !           521: Predefined Read-Only Number Registers
        !           522: .ftR
        !           523: .TS
        !           524: c2l
        !           525: c2l2l
        !           526: n2l2l.
        !           527: .ftI
        !           528: .bd I 3
        !           529: Section        Register
        !           530: Reference      Name    Description
        !           531: .ftR
        !           532: .bd I
        !           533: .xx
        !           534: 7.3    \fB&$\fR        Number of arguments available at the current macro level.
        !           535: -      \fB&A\fR        Set to 1 in \*(TR, if \fB\-a\fR option used; always 1 in \*(NR.
        !           536: 11.1   \fB&H\fR        Available horizontal resolution in basic units.
        !           537: 5.3    \fB&L\fR        Set to current \fIline-spacing\fR (\fBls\fR) parameter
        !           538: -      \fB&P\fR        Set to 1 if the current page is being printed; otherwise 0.
        !           539: -      \fB&T\fR        Set to 1 in \*(NR, if \fB\-T\fR option used; always 0 in \*(TR.
        !           540: 11.1   \fB&V\fR        Available vertical resolution in basic units.
        !           541: 5.2    \fB&a\fR        Post-line extra line-space most recently utilized \
        !           542: using \fB\ex\fI\'N\|\'\fR.
        !           543: 19     \fB&c\fR        Number of \fIlines\fR read from current input file.
        !           544: 7.4    \fB&d\fR        Current vertical place in current diversion; equal to \fBnl\fR, if no diversion.
        !           545: 2.2    \fB&f\fR        Current font as physical quadrant (1-4).
        !           546: 4      \fB&h\fR        Text base-line high-water mark on current page or diversion.
        !           547: 6      \fB&i\fR        Current indent.
        !           548: 4.2    \fB&j\fR        Current adjustment mode and type.
        !           549: 4.1    \fB&k\fR        Length of text portion on current partial output line.
        !           550: 6      \fB&l\fR        Current line length.
        !           551: 4      \fB&n\fR        Length of text portion on previous output line.
        !           552: 3      \fB&o\fR        Current page offset.
        !           553: 3      \fB&p\fR        Current page length.
        !           554: 2.3    \fB&s\fR        Current point size.
        !           555: 7.5    \fB&t\fR        Distance to the next trap.
        !           556: 4.1    \fB&u\fR        Equal to 1 in fill mode and 0 in nofill mode.
        !           557: 5.1    \fB&v\fR        Current vertical line spacing.
        !           558: 11.2   \fB&w\fR        Width of previous character.
        !           559: -      \fB&x\fR        Reserved version-dependent register.
        !           560: -      \fB&y\fR        Reserved version-dependent register.
        !           561: 7.4    \fB&z\fR        Name of current diversion.
        !           562: .TE
        !           563: .in0
        !           564: .fi

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