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From: ed...@ucbopal.CC.Berkeley.ARPA
Newsgroups: net.text
Subject: enhanced ditroff doc (long)
Message-ID: <252@ucbopal.CC.Berkeley.ARPA>
Date: Wed, 3-Jul-85 17:30:17 EDT
Article-I.D.: ucbopal.252
Posted: Wed Jul  3 17:30:17 1985
Date-Received: Fri, 5-Jul-85 05:42:32 EDT
Organization: Univ. of Calif., Berkeley CA USA
Lines: 890

For all of you who are interested in the enhanced ditroff that we run
at the UCB computer center, the following is a copy of the Addendum
to the Nroff/Troff Users Manual that explains many of our changes, plus
the original ones in ditroff.  This copy has been run through our new
nroff (which has similar enhancements) and then colcrt, so that
pagination is all messed up, but underlining and superscripts show
up and can be mailed safely.

Changes that aren't discussed there are (just off the top of my head):

1) All macro, string, diversion and number registers names are hashed.
Special character names are found with a binary search.

2) Multiple ranges are supported (for devices like the APS-Micro5, where
the 5-80 point size range is divided into 4 ranges, which don't scale up

3) Each typesetter description table may have a set of characters defined
that ditroff may use to hyphenate lines.  Thus, for each dash, we have
one name that is hyphenable, and one that isn't.

4) Strings and macros are now usually stored as characters rather than
tchar (4 bytes on a VAX), since they don't have font and size info.

5) Lots of bug fixes.

6) Some speed improvements.

And with this all, we have a version of ditroff, with all similar
functionality, that runs on a PDP (though we have to be careful with
the font table size, to prevent running out of core).

Let me repeat again, for those that missed the first message, that we
at Academic Computing Services are unable to distribute this software,
but we are talking with CSRG (the ones who distribute BSD UNIX) to
combine their version, which contains graphics enhancement for Gremlin,
with ours and distribute that (someday).

Edward Moy
Academic Computing Services
University of California
Berkeley, CA  94720


----- cut here ----------------------------------- cut here ----------

                                Addendum to the
                                -------- -- ---
                           NROFF/TROFF User's Manual

       =>  This addendum supersedes all previous addenda to this manual.
           ---- -------- ---------- --- -------- ------- -- ---- ------

0.  Key
-   ---

     The changes made in NROFF and TROFF since the NROFF/TROFF  User's  Manual
                                                   ----- -----  ---- -  ------
     was  produced in October 1976 fall into three groups, here marked as fol-

     (O)  ``Old'' changes - a small group of changes described on  a  one-page
          addendum dated May 15, 1977.

     (D)  Changes that form part of  device-independent  TROFF  (ditroff),  an
          improved  version  of  NROFF/TROFF released by AT&T Bell Labs in the
          early 1980's.

     (C)  Further changes made by UC Berkeley's  Academic  Computing  Services
          (ACS)   and  implemented  on  the  central  campus  computer  center
          machines, maintained by Computer Facilities and Communications (CFC)

     In addition, this addendum includes a group of command-line options which
     are unique to the CFC environment:

     (Q)  Options relating to the CFC system of queueing and output  distribu-

     Finally, there are a few items marked

     (U)  ``Undocumented'' - features that are not new, but are not  mentioned
          in the original manual or are incorrectly described there.

1.  Command-Line Options
-   ------- ---- -------

1.1.  New Options
- -   --- -------

     -.cmd     The NROFF/TROFF command .cmd is executed before normal process-
       ---                              ---
               ing  and  before any macro packages are read.  If .cmd contains
               spaces or other characters of significance  to  the  shell,  it
               should be quoted.  (C)

     -bbox     Specifies the box number in which the output is to  be  placed.

May 1985                             - 1 -

NROFF/TROFF User's Manual

               The use of box numbers is typesetter dependent.  (Q)

     -Fdir     The -F option causes terminal information for  NROFF  and  font
       ---          -
               information  for  TROFF  to  be accessed from the directory dir
               instead  of  the  default  /usr/ucb/lib/term  (for  NROFF)   or
                                           --- --- --- ----
               /usr/ucb/lib/font/devname  (for TROFF, where name is the output
                                    ----                    ----
               device name).  (D, C)

     -h        (NROFF only)  Causes output tabs to be used  during  horizontal
               spacing  to  speed output and reduce output byte count.  Device
               tab settings are  assumed  to  be  every  8  nominal  character
               widths.   The  default settings of input (logical) tabs is also
               initialized to every 8 nominal character widths.  (O)

     -Iident   Use the string ident (which should be  quoted  if  it  contains
       -----                  -----
               spaces  or  other  characters  of significance to the shell) to
               identify the typeset job.  This string is used for confirmation
               of  enqueuing  and on job completion.  If not given, TROFF will
               try to use the list of file(s)  given  it  as  the  string,  if
               any.  (Q)

               Send mail to the mail address given in mailaddr rather than  to
                    ----                              --------
               the user who submitted the job.  (Q)

     -N        Don't write enqueuing confirmation directly to terminal.   Send
               mail instead.  (Q)

     -Olist    Directs trr to typeset only the specified pages.  This is  use-
       ----            ---
               ful with the -S option.  (Q)

               Save the intermediate ASCII output in the file filename,  while
               still typesetting (using the -Q or -V options).  (Q)
                                             -     -

     -Tname    Specifies the output device for  both  NROFF  and  TROFF.   The
               default  output devices are defined locally (currently Teletype
               Corporation Model 37 for NROFF and  Autologic  APS-Micro5   for
               TROFF).  These defaults may be  overriden  by  the  environment
               variable  TROFF for TROFF and NROFF for NROFF (C), which may in
               turn be overridden by the -T command-line option (D).  The case
               of letters used in the name argument is ignored (C).

     -un       Set the amount of embolding (see .bd command) on font  position
       -                                         --
               3 to n typesetter units.  (D)

     -V        (TROFF only.)  Produce intermediate ASCII output for the speci-
               fied  typesetter  but tell trr (see -t below) to process it for
                                          ---       -
               previewing on the Versatec V80 Printer-Plotter.  A  -V  preview
               uses  the  Versatec's  Hershey type faces, similar to the Times

    As of July 1, 1985,  the  APS-Micro5  replaced  the
previous default device, the Graphics System C/A/T.

May 1985                             - 2 -

NROFF/TROFF User's Manual

               family but with somewhat bulkier  characters  than  the  photo-
               typesetter  fonts.   Line  and page breaks occur in the preview
               exactly as they would on the typesetter.  (Q)

     -x        Interpret NROFF/TROFF commands in expanded mode (see section  5
               below).   The  environment  variable EXPANDED, if defined, also
               sets expanded mode.  (C)

     -z        Process text, but suppress formatted output.   Diagnostics  and
               messages from .tm and .ab requests will still be output and .sy
                              --      --                                    --
               commands will still be executed.  (O)

1.2.  Modified Options
- -   -------- -------

     -s        For TROFF only, the -s flag is ignored (the typesetting  system
               imposes its own stop count).  (Q)

     -t        The TROFF command normally initiates two other processes.   The
               real  text  processing process sends its ASCII output (which is
               in  a  device-independent  format  (D))  to   the   postproces-
               sing/enqueuing  process,  trr.   The  -t option causes TROFF to
                                         ---          -
               only call  the  real  text  processing  process,  so  that  the
               device-independent  output, which would be sent to the standard
               output (D), may be stored in a file and later re-typeset  using
               trr.  (Q)

     -p, -g, +n
               These options have been eliminated.  (D)

2.  Requests
-   --------

2.1.  New Requests
- -   --- --------
Request   Initial   If No
-------   -------   -- --
Form      Value     Argument  Notes  Explanation
----      -----     --------  -----  -----------
.ab text  -         -         -      Abort.  Print text on the diagnostic out-
                                     put  (normally,  the  terminal)  and ter-
                                     minate without  further  processing.   If
                                     text   is  missing,  the  message  ``User
                                     Abort'' is printed.  The output buffer is
                                     flushed.  (O)

.cf file  -         -         -      Copy file to output.  Copies the contents
                                     of  file into the NROFF/TROFF output file
                                     at this point,  uninterpreted  (U).   For
                                     TROFF,  the  contents  of  file should be
                                     compatible with the form of  TROFF  ASCII
                                     output   if   the   results   are  to  be
                                     reasonable (D).
.kn       kern off  -         E      Kerning  mode  on.   (Kerning  means  the
                                     adjustment of inter-character spacing for
                                     specific character-pairs.)  If the  kern-
                                     ing entry for a character pair, as stored
                                     in the width  tables,  is  non-zero,  the
                                     character  pair is kerned if this mode is

May 1985                             - 3 -

NROFF/TROFF User's Manual

                                     turned on.  (C)

.nk       kern off  -         E      Kerning mode off.  (C)

.im file  -         -         -      Input macro file.  The  input-macro  com-
                                     mand  reads from file the macros, strings
                                     and  diversions  stored  there   by   the
                                     output-macro command .om.  (C)
.om file  -         -         -      Output macro file.  The output-macro com-
                                     mand writes to file the currently defined
                                     macros,  strings  and  diversions  in   a
                                     binary form that can be quickly read back
                                     in   using   the   input-macro    command
                                     .im.  (C)
.rv +N    off       previous  E,m    Start  reverse-printing  mode.   Text  is
                                     printed  from  right-to-left  across  the
                                     page.  The right paper margin is  set  by
                                     +N  as  measured  from  the  current left
                                     paper margin (page offset).  A  value  of
                                     zero  for  N restores the normal left-to-
                                     right printing.  (C)

.sy cmd   -         -         -      Execute a system command.  The UNIX  com-
                                     mand  cmd  is  executed  (D),  using  the
                                     current login shell  (C).   The  standard
                                     input for cmd is normally closed (D).  If
                                     the command line ends with the characters
                                     ``<<'',  standard input is taken from the
                                     following lines (read in copy  mode),  up
                                     to  (but  not  including) a line begining
                                     with ``..''.  If a name of a  macro  fol-
                                     lows  ``<<'',  then  standard  input ter-
                                     minates when the  command  ``.macroname''
                                     is  encountered,  and  the  macro is then
                                     executed.  (C) (The command `.!' was pre-
                                     viously  a  synonym  for .sy, but since !
                                     is frequently used as a  string  name  in
                                     macro   packages,   this  form  has  been
                                     disabled (C).)

2.2.  Modified Requests
- -   -------- --------

     .ad c     The adjustment type indicator c may now be  a  number  obtained
         -                                   -
               from the .j register described in Section 4 below.  (O)
     .fp n F dir
         - - ---
               The .fp command now accepts a third argument  that  causes  the
               width  table  for the font to be loaded from directory dir (D).
               A  value  of  zero  for  n   specifies   the   next   available
               position (C).

     .ft F     This command (or \fF and \f(FF)  causes  the  font  F,  if  not
         -                        -        --                      -
               currently  mounted  by  default or by a previous command, to be
               loaded in the next free font position.  (D, C)

May 1985                             - 4 -

NROFF/TROFF User's Manual

     .fz       This request (O) has been eliminated (D).

     .ht N     Sets the hyphenation threshold to N.  This threshold, which  is
         -                                       -
               initially  set  to  the  number 160, is the limit above which a
               calculated hyphenation point  is  considered  acceptable.   The
               higher N, the less hyphenation will occur.  (U)

     .li       Has been eliminated.  (D)

     .pi cmd   This command, which causes the output  to  be  piped  into  cmd
         ---                                                               ---
               instead of the standard output, now exists for TROFF as well as
               NROFF.  (D)

     .po +N    Default units are m, not v as stated.  (U)
         --                      -      -

     .ps +N    N may now contain a scale indicator (default is still p).   The
         --    -
               point size used is that size greater than or equal to the value
               of N, rounded to the nearest whole point size.

     .so file  If either file ends with the suffix ``.im'' (input macro) or if
         ----            ----
               a  file named exists, and if this file is of the proper
               format, a (fast) .im command is done on the file (otherwise,  a
               normal .so is done) (C).  The contents of file are now interpo-
                       --                                ----
               lated at the point the .so request is encountered (O).
3.  Escape Sequences
-   ------ ---------

3.1.  New Escape Sequences
- -   --- ------ ---------

               The numeric expression is evaluated and the result is available
               in-line.  (C)

     \+        This is a breakable, but unpaddable space.  (C)

        ---------- ---- -----
               If expression, which may be a numeric expression  or  a  string
               comparison  (as  in the .if command) is true, the entire escape
               sequence is replaced with the  sequence  true,  otherwise  with
               false.    Both   true   and   false   may  contain  further  \?
               -----            ----         -----                          -
               sequences.  (D)

     \D'c n1 n2 ...'
        - -- --
               This is the general form of a  group  of  diagram-drawing  com-
               mands,  which  can be enlarged further.  The character c speci-
               fies the type of element to be drawn  (see  list  below).   The
               parameters  n1  n2  ...   may  be number or expression, and may
                           --  --
    The character used as delimeters ('...'  here)  may
be any character not already within the delimeters and,
for safety, not part of a numerical expression (like  +
and  -).  However, escape sequences using the same del-
imeters may be nested.

May 1985                             - 5 -

NROFF/TROFF User's Manual

               specify a unit scaling (default is m for horizontal and  v  for
                                                  -                     -
               vertical parameters).  The character c and the numerical param-
               eters are separated by spaces.  These requests are all  ignored
               by NROFF.  (D)

               \D'l dh dv'
                    -- --
                    Draw a line from the current position to a point dh to the
                    right and dv down.

               \D'c d'
                    Draw a circle of diameter d with left side at the  current

               \D'e d1 d2'
                    -- --
                    Draw an ellipse of horizontal  diameter  d1  and  vertical
                    diameter d2, with left side at current position.

               \D'a dh1 dv1 dh2 dv2'
                    --- --- --- ---
                    Draw an arc whose center is at dh1 to the  right  and  dv1
                                                   ---                     ---
                    down  from the current position.  The arc extends from the
                    current position counterclockwise, until it intersects the
                    line  (or  an extension of the line) from the arc's center
                    to a point that is dh2 to the right of and dv2  down  from
                                       ---                     ---
                    the  center.   The final position after drawing the arc is
                    dh1+dh2 to the right and dv1+dv2  down  from  the  initial
                    --- ---                  --- ---

               \D'~ dh1 dv1 dh2 dv2 ...'
                    --- --- --- ---
                    Draw a B-spline going from current position by  dh1,  dv1,
                                                                    ---   ---
                    then by dh2, dv2, then ... .
                            ---  ---

     \E        This escape sequence can be used in place of the normal  escape
               character  (usually  a backslash \) at the beginning of another
               escape sequence and will  prevent  this  second  sequence  from
               being  interpreted  in copy mode (if it normally was).  It will
               be interpreted only in non-copy mode, i.e., in normal text out-
               put  mode  and in diversions.  Thus, \nx is interpreted in copy
               mode, while \Enx is not.  (C)

     \gx, \g(xx
       -     --
               Return the format of register x or xx; return nothing if  x  or
                                             -    --                     -
               xx has not yet been referenced in a .nr, .af, \n or \k request,
               --                                   --   --  --    --
               or is read-only.  The value returned  can  be  saved  and  used
               later  in  a  .af request to restore a previous format.  Inter-
               preted in copy mode.  (D)

     \H'n'     Character heights are set to the value  n  (the  default  scale
        -                                              -
               factor  is  points  (C)), without changing widths.  A height of
               the form +n is an increment on the current point size  (not  on
                        --                                             ---
               previous  height  if  this  has been reset by an earlier \H); a
               height of zero restores the  height  to  the  point  size  (C).
               Ignored  in  NROFF,  and  effective in TROFF only if the output
               device allows modification of height independent of width.  (D)

May 1985                             - 6 -

NROFF/TROFF User's Manual

     \I        This escape sequence can be used in place of the normal  escape
               character  (usually  a backslash \) at the beginning of another
               escape sequence and will  cause  this  second  sequence  to  be
               interpreted immediately (copymode or not).  (C)

     \Kx       If kerning mode is turned on, treat  the  character  x  as  the
       -                                                            -
               first  character  in a character pair for possible kerning with
               the next occurring character.  The character x does not  print,
               but is only used for possible kerning calculation.  (C)

     \P        Output the last character saved with the ``\R'' command.  (C)

     \R        Save the last printed character.  This saved character  can  be
               reissued with the ``\P'' command.  (C)

                                                o            o
     \S'n'     Output is slanted n degrees (-180  < n  <  180 ).   Ignored  in
        -                        -                - -  -
               NROFF,  while  the  effect  in TROFF depends on what slants, if
               any, the output device can produce.  (D).

     \Tx       If x is an alphanumeric character, this escape sequence returns
       -          -
               0  if the character is a short lower case letter without a des-
               cender (like e), 1, if the character has a descender (like  y),
                            -                                              -
               2,  if  the  character is tall and without a descender (like H)
               and 3 if it is tall and has a descender.  The  number  register
               \n(ct is also affected.  (C)
               -- --

     \~        This is a paddable, but unbreakable space.  (C)

3.2.  Modified Escape Sequences and Corrections to Documentation
- -   -------- ------ --------- --- ----------- -- -------------

     \!        Transparent mode has been fixed, so it can not only carry  code
               transparently from diversions to file level (or to other diver-
               sions), but also from file level to output.   It  may  thus  be
               used to send commands to a postprocessor.  (D)

     \:        This undocumented character of  pre-ditroff  NROFF/TROFF  (non-
               printing   unless   translated)  (U)  has  been  eliminated  in
               ditroff (D).

     \jx       This undocumented escape sequence of  pre-ditroff  NROFF/TROFF,
       -                                                 -------
               which stored in the register x (one-character only) the current
               horizontal position on the output line (U) has been  eliminated
               in ditroff (D).

     \k        This sequence can store its output in a two-character  register
               using  \k(xx  as well as in a one-character register using \kx.
                         --                                                 -
               Whichever form is used, the value found is also recorded in the
               register hp.  (U)

4.  Predefined Number Registers and Strings
-   ---------- ------ --------- --- -------

4.1.  New Number Registers
- -   --- ------ ---------

     $$        Read-only.   Contains  the  process-id   of   the   NROFF/TROFF

May 1985                             - 7 -

NROFF/TROFF User's Manual

               process.  (D)

     .B        Emboldening factor of the current  font,  as  set  by  the  .bd
               command.  (C)

     .K        Read-only.   Set  to  1  if  kerning  mode  is  turned  on;   0
               otherwise.  (C)

     .L        Read-only.  Contains the current line-spacing parameter,  i.e.,
               the value of the argument of the most recent .ls request.  (O)

     .M        Read-only.  For TROFF, if non-zero, contains the maximum print-
               able page length in machine units.  (C)

     .O   -    Read-only.  For TROFF, contains the initial value of  the  page
               offset (see section 5.2).  (C)

     .P        Read-only.  Contains 1 if the current page is being printed,  0
               otherwise,  i.e., if the current page does not appear in the -o
                                                          ---                -
               option list.  (O)

     .R        Count of number registers that remain available for use.  (D)

     .W        Read-only.  For TROFF, contains the printable  paper  width  of
               the typesetting device in machine units.  (C)

     .X        Read-only.  Set to 1 in expanded mode; 0 otherwise.  (C)

     .b        Pre-line extra line-space from  last  printed  line.   This  is
               nonzero if a \x'N' with negative N occurred in that line.  (C)
                               -                -

     .j        Read-only.  Indicates the current  adjustment  mode  and  type.
               Can  be saved and used later as the argument to the .ad request
               (q.v.) to restore a previous adjustment mode.  (O)

     .k        Read-only.  Contains the horizontal size of  the  text  portion
               including  the  size  of  the  current  indent,  if any) of the
               current,  partially-collected  output  line,  if  any,  in  the
               current  environment.   When  fill  mode is in effect this text
               portion does not include the current partially-collected  word,
               if any.  (O)

     c.        Provides general register access to the  input  line-number  in
               the  current  input file.  Contains the same value as the read-
               only .c register.  (O)

     hp        Contains the value returned by the most recent \k request.  (U)

4.2.  Modified Number Registers
- -   -------- ------ ---------

     .a        This register now contains the post-line  extra  line-space  of
               the  last  printed line, as opposed to that of the last line in
               which \x'N' was used.  (C)

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NROFF/TROFF User's Manual

4.3.  New String
- -   --- ------

     .T        The string \*(.T contains the name of  the  NROFF/TROFF  output
                          -   -
               device,  e.g.,  37  or  aps  (D).  The name will be entirely in
                               --      ---
               lower case (C).

5.  Other Important Changes
-   ----- --------- -------

     1.   For TROFF, the size of a basic machine  unit  is  dependent  on  the
          typesetter.  Hence units such as inches, points, em's etc. should be
          used whenever possible, so as to give  consistent  results  on  dif-
          ferent typesetters.  (D)

     2.   For TROFF, the initial page offset may not be 26/27 of an  inch  (as
          it  is  for  the C/A/T), but is that offset that will cause the left
          margin to be one inch from the edge of the paper.  This value may be
          obtained from the \n(.O register.  (C)
                            --  -

     3.   For TROFF, the number of fonts is not necessarily  limited  to  four
          (as   on  the  C/A/T),  but  depends  on  the  capabilities  of  the
          typesetter.  For typesetters that allow  the  loading  of  different
          fonts , this can be accomplished either by an .fp command, or simply
          by using the .ft or \f commands to switch to the desired font.  (D)
                        --    --

     4.   There is now an expanded mode, obtainable by using -x on the command
                          -------- ----                       -
          line  or  by  setting the EXPANDED environment variable to some non-
          null value.  All macro, number register, string and diversion  names
          may  be  up to 8 characters long.  Commands now may be called with a
          longer synonym  (see  following  table).   Because  of  the  longer,
          variable-length  names, spaces are now required to separate commands
          and arguments (e.g., .nr XX 4, .nrXX 4, .nr XX4, etc.  are no longer
             Strings, number registers and fonts of any  length  name  may  be
          called  with \*[x..x], \n[x..x] and \f[x..x], respectively.  Special
                          -  -      -  -         -  -
          characters may also be called with \[x..x].  The format of a  number
                                               -  -
          register  may  be accessed with \g[x..x], and the current input-line
                                             -  -
          horizontal  position  may  be  recorded  in  register   x..x    with
                                                                  -  -
          \k[x..x].   Size  changes of any number of digits may be called with
             -  -
             -  -
             While  the  standard  (unexpanded  mode)  forms  of  most  escape
          sequences  will  still  function  correctly, \sN is interpreted dif-
          ferently in expanded mode.  This form of the  command  accepts  only
          one  digit  in expanded mode, while in normal mode it accepts one or
          two digits depending on whether the C/A/T phototypesetter  has  that
          size.   A  new  form has been added in expanded mode for two digits,
          namely \s(NN.  The number may be preceded with a plus or minus  sign
          to indicate a relative size change, e.g., \s+4 and \s(-10.  (C)
                                                    -- -     --  --

     5.   For TROFF, there are no longer specific fonts named R, I, B  and  S.
          Instead,  for  the  font  change commands, these are synonymous with

    The APS-Micro5 and the Versatec allow fonts  to  be
automatically loaded; the C/A/T does not.

May 1985                             - 9 -

NROFF/TROFF User's Manual

                          Optional Expanded Mode Command Names

            | ab | abort    | eo | escoff   | lt | lentitle | rm | rmmacro |
            | ad | adjust   | ev | environ  | mc | margchar | rn | rename  |
            | af | assgnfmt | ex | exit     | mk | mark     | rr | rmreg   |
            | am | apndmac  | fc | fieldch  | na | noadjust | rs | restore |
            | as | apndstr  | fi | fill     | ne | need     | rt | return  |
            | bd | bold     | fl | flush    | nf | nofill   | rv | reverse |
            | bp | beginpg  | fp | fontpos  | nh | nohyphen | so | source  |
            | br | break    | ft | font     | nk | nokern   | sp | space   |
            | c2 | ctrlchr2 | hc | hyphchar | nm | numlin   | ss | spsize  |
            | cc | ctrlchr  | ht | hyphthr  | nn | nonumlin | sv | save    |
            | ce | center   | hw | hyphword | nr | numreg   | sy | system  |
            | cf | copyfile | hy | hyphen   | ns | nospace  | ta | tab     |
            | ch | chngtrap | ie | ifelse   | nx | nextfile | tc | tabchar |
            | cs | constsp  | if | if       | om | outmacro | ti | tempind |
            | cu | contul   | ig | ignore   | os | outsave  | tl | title   |
            | da | divapnd  | im | inmacro  | pc | pagechar | tm | termmesg|
            | de | define   | in | indent   | pi | pipe     | tr | translat|
            | di | divert   | it | inptrap  | pl | pagelen  | uf | ulfont  |
            | ds | defstr   | kn | kern     | pm | prmacro  | ul | underln |
            | dt | divtrap  | lc | leadchar | pn | pagenum  | vs | vertsp  |
            | ec | escchar  | lg | ligature | po | pgoffset | wh | when    |
            | el | else     | ll | linelen  | ps | ptsize   |    |         |
            | em | endmacro | ls | linesp   | rd | read     |    |         |

          whatever is mounted on font positions 1, 2, 3 and n, where n is  the
          font position of the (first) mounted special font.  For the .fp com-
          mand, R, I, B and S may be used for the first argument  (font  posi-
          tion)  but  not  for the second (font name).  Thus .fp I hI is valid
                                                              -- - --
          (on a device where hI is  a  valid  font  name),  but  .fp  3  B  is
                             --                                   --  -  -
          not.  (C)

     6.   NROFF/TROFF command names cannot be used, accidently  or  otherwise,
          as  names  of  strings,  macros or diversions.  However, they can be
          renamed (with the .rn command) and then the  original  name  may  be
          used.  (C)

     7.   The number of environments has been increased from 3  to  5.   Since
          most  macro  packages  use  environments  1 and 2 in addition to the
          standard environment 0, users may feel  free  to  use  the  two  new
          environments, 3 and 4.  (C)

     8.   The conditionally accepted part of an .ie or .if request is now com-
                                                 --     --
          pletely  ignored  if  the test fails, rather than being read in copy
          mode.  Thus there is no augmentation  of  number-registers  if  this
          material contains \n+ calls.  (However, material concealed using .ig
                            ---                                             --
          rather than .ie or .if is still read in copy mode.)  (C)
                       --     --

     9.   If the current login shell is the csh,  then  .so,  .nx,  etc.  will
                                            ---          --    --
          interpret ~ and ~user in the path for the filename.  (C)

May 1985                            - 10 -

			  SCO's Case Against IBM

November 12, 2003 - Jed Boal from Eyewitness News KSL 5 TV provides an
overview on SCO's case against IBM. Darl McBride, SCO's president and CEO,
talks about the lawsuit's impact and attacks. Jason Holt, student and 
Linux user, talks about the benefits of code availability and the merits 
of the SCO vs IBM lawsuit. See SCO vs IBM.

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