Ubuntu Manpage: rcsdiff - compare RCS revisions

NAME

       rcsdiff - compare RCS revisions

SYNOPSIS

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

DESCRIPTION

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.

EXAMPLE

       The command

               rcsdiff  f.c

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

ENVIRONMENT

       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.

DIAGNOSTICS

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

IDENTIFICATION

       Author: Walter F. Tichy.
       Manual Page Revision: 5.9.4; Release Date: 2019-12-31.
       Copyright © 2010-2015 Thien-Thi Nguyen.
       Copyright © 1990, 1991, 1992, 1993 Paul Eggert.
       Copyright © 1982, 1988, 1989 Walter F. Tichy.