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PROGRAM:

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: 2015-06-21.
Copyright © 2010-2015 Thien-Thi Nguyen.
Copyright © 1990, 1991, 1992, 1993 Paul Eggert.
Copyright © 1982, 1988, 1989 Walter F. Tichy.

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