rcsdiff(1)

1RCSDIFF(1)                  General Commands Manual                 RCSDIFF(1)
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NAME

6       rcsdiff - compare RCS revisions
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SYNOPSIS

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

13       rcsdiff runs diff(1) to compare two revisions of each RCS file given.
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15       Filenames matching an RCS suffix denote RCS files;  all  others  denote
16       working files.  Names are paired as explained in ci(1).
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18       The  option  -q  suppresses diagnostic output.  Zero, one, or two revi‐
19       sions may be specified with -r.  The  option  -ksubst  affects  keyword
20       substitution  when  extracting  revisions,  as  described in co(1); for
21       example, -kk -r1.1 -r1.2 ignores differences  in  keyword  values  when
22       comparing  revisions  1.1  and 1.2.  To avoid excess output from locker
23       name substitution, -kkvl is assumed if (1) at most one revision  option
24       is  given,  (2)  no -k option is given, (3) -kkv is the default keyword
25       substitution, and (4) the working file's  mode  would  be  produced  by
26       co -l.   See co(1) for details about -T, -V, -x and -z.  Otherwise, all
27       options of diff(1) that apply to regular files are accepted,  with  the
28       same meaning as for diff.
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30       If both rev1 and rev2 are omitted, rcsdiff compares the latest revision
31       on the default branch (by default the trunk) with the contents  of  the
32       corresponding  working  file.   This is useful for determining what you
33       changed since the last checkin.
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35       If rev1 is given, but rev2 is omitted, rcsdiff compares  revision  rev1
36       of the RCS file with the contents of the corresponding working file.
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38       If  both  rev1  and rev2 are given, rcsdiff compares revisions rev1 and
39       rev2 of the RCS file.
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41       Both rev1 and rev2 may be given numerically or symbolically.
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EXAMPLE

44       The command
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46               rcsdiff  f.c
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48       compares the latest revision on the default branch of the RCS  file  to
49       the contents of the working file f.c.
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ENVIRONMENT

52       RCSINIT
53              Options  prepended to the argument list, separated by spaces.  A
54              backslash escapes spaces within an option.  The RCSINIT  options
55              are  prepended to the argument lists of most RCS commands.  Use‐
56              ful RCSINIT options include -q, -V, -x, and -z.
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58       RCS_MEM_LIMIT
59              Normally, for speed, commands either memory  map  or  copy  into
60              memory  the  RCS file if its size is less than the memory-limit,
61              currently defaulting to ``unlimited''.   Otherwise  (or  if  the
62              initially-tried  speedy  ways  fail),  the commands fall back to
63              using standard i/o routines.  You can adjust the memory limit by
64              setting  RCS_MEM_LIMIT to a numeric value lim (measured in kilo‐
65              bytes).  An empty value is silently ignored.  As a side  effect,
66              specifying RCS_MEM_LIMIT inhibits fall-back to slower routines.
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68       TMPDIR Name  of  the  temporary directory.  If not set, the environment
69              variables TMP and TEMP are inspected instead and the first value
70              found  is  taken;  if  none  of  them  are set, a host-dependent
71              default is used, typically /tmp.
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DIAGNOSTICS

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

78       Author: Walter F. Tichy.
79       Manual Page Revision: 5.9.4; Release Date: 2019-07-27.
80       Copyright © 2010-2015 Thien-Thi Nguyen.
81       Copyright © 1990, 1991, 1992, 1993 Paul Eggert.
82       Copyright © 1982, 1988, 1989 Walter F. Tichy.
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