rcsdiff - compare RCS revisions

rcsdiff runs diff(1) to compare two revisions of each RCS file given.

       Filenames matching an RCS suffix denote RCS files; all others denote working files.  Names are paired  as
       explained in ci(1).

       The  option  -q suppresses diagnostic output.  Zero, one, or two revisions may be specified with -r.  The
       option -ksubst affects keyword substitution  when  extracting  revisions,  as  described  in  co(1);  for
       example,  -kk-r1.1-r1.2 ignores differences in keyword values when comparing revisions 1.1 and 1.2.  To
       avoid excess output from locker name substitution, -kkvl is assumed if (1) at most one revision option is
       given, (2) no -k option is given, (3) -kkv is the default  keyword  substitution,  and  (4)  the  working
       file's  mode  would be produced by co-l.  See co(1) for details about -T, -V, -x and -z.  Otherwise, all
       options of diff(1) that apply to regular files are accepted, with the same meaning as for diff.

       If both rev1 and rev2 are omitted, rcsdiff compares the latest revision on the default branch (by default
       the trunk) with the contents of the corresponding working file.  This is useful for determining what  you
       changed since the last checkin.

       If  rev1  is given, but rev2 is omitted, rcsdiff compares revision rev1 of the RCS file with the contents
       of the corresponding working file.

       If both rev1 and rev2 are given, rcsdiff compares revisions rev1 and rev2 of the RCS file.

       Both rev1 and rev2 may be given numerically or symbolically.

       Exit status is 0 for no differences during any comparison, 1 for some differences, 2 for trouble.

RCSINIT
              Options prepended to the argument list, separated by spaces.  A backslash escapes spaces within an
              option.   The  RCSINIT  options  are prepended to the argument lists of most RCS commands.  Useful
              RCSINIT options include -q, -V, -x, and -z.

       RCS_MEM_LIMIT
              Normally, for speed, commands either memory map or copy into memory the RCS file if  its  size  is
              less  than  the  memory-limit,  currently  defaulting  to  ``unlimited''.   Otherwise  (or  if the
              initially-tried speedy ways fail), the commands fall back to using standard i/o routines.  You can
              adjust the memory limit by setting RCS_MEM_LIMIT to a numeric value lim (measured  in  kilobytes).
              An empty value is silently ignored.  As a side effect, specifying RCS_MEM_LIMIT inhibits fall-back
              to slower routines.

       TMPDIR Name of the temporary directory.  If not set, the environment variables TMP and TEMP are inspected
              instead  and  the first value found is taken; if none of them are set, a host-dependent default is
              used, typically /tmp.

       The command

               rcsdifff.c

       compares the latest revision on the default branch of the RCS file to the contents of  the  working  file
       f.c.

       Author: Walter F. Tichy.
       Manual Page Revision: 5.10.1; Release Date: 2025-02-07.
       Copyright © 2010-2022 Thien-Thi Nguyen.
       Copyright © 1990, 1991, 1992, 1993 Paul Eggert.
       Copyright © 1982, 1988, 1989 Walter F. Tichy.

       rcsdiff - compare RCS revisions

ci(1), co(1), diff(1), ident(1), rcs(1), rcsmerge(1), rlog(1).

       Walter F. Tichy, RCS--A System for Version Control, Software--Practice&Experience15,  7  (July  1985),
       637-654.

       The  full  documentation  for RCS is maintained as a Texinfo manual.  If the info(1) and RCS programs are
       properly installed at your site, the command

              inforcs

       should give you access to the complete manual.  Additionally, the RCS homepage:

              http://www.gnu.org/software/rcs/

       has news and links to the latest release, development site, etc.

GNU RCS 5.10.1                                     2025-02-07                                         RCSDIFF(1)

rcsdiff  [  -ksubst  ]  [  -q  ]  [ -rrev1 [ -rrev2 ] ] [ -T ] [ -V[n] ] [ -xsuffixes ] [ -zzone ] [ diffoptions ] file...