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RCSDIFF(1) General Commands Manual RCSDIFF(1)
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 substitu-
tion, -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 op-
tions 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: 5.10.1; Release Date: 2022-02-19.
Copyright (C) 2010-2022 Thien-Thi Nguyen.
Copyright (C) 1990, 1991, 1992, 1993 Paul Eggert.
Copyright (C) 1982, 1988, 1989 Walter F. Tichy.
SEE ALSO
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 & Experience 15, 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
info rcs
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 2022-02-19 RCSDIFF(1)
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