rcsmerge - Online in the Cloud

PROGRAM:

NAME

rcsmerge - merge RCS revisions

SYNOPSIS

rcsmerge [options] file

DESCRIPTION

rcsmerge incorporates the changes between two revisions of an RCS file into the
corresponding working file.

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

At least one revision must be specified with one of the options described below, usually
-r. At most two revisions may be specified. If only one revision is specified, the
latest revision on the default branch (normally the highest branch on the trunk) is
assumed for the second revision. Revisions may be specified numerically or symbolically.

rcsmerge prints a warning if there are overlaps, and delimits the overlapping regions as
explained in merge(1). The command is useful for incorporating changes into a checked-out
revision.

OPTIONS

-A Output conflicts using the -A style of diff3(1), if supported by diff3. This
merges all changes leading from file2 to file3 into file1, and generates the most
verbose output.

-E, -e These options specify conflict styles that generate less information than -A. See
diff3(1) for details. The default is -E. With -e, rcsmerge does not warn about
conflicts.

-ksubst
Use subst style keyword substitution. See co(1) for details. For example,
-kk -r1.1 -r1.2 ignores differences in keyword values when merging the changes from
1.1 to 1.2. It normally does not make sense to merge binary files as if they were
text, so rcsmerge refuses to merge files if -kb expansion is used.

-p[rev]
Send the result to standard output instead of overwriting the working file.

-q[rev]
Run quietly; do not print diagnostics.

-r[rev]
Merge with respect to revision rev. Here an empty rev stands for the latest
revision on the default branch, normally the head.

-T This option has no effect; it is present for compatibility with other RCS commands.

-V Print RCS's version number.

-Vn Emulate RCS version n. See co(1) for details.

-xsuffixes
Use suffixes to characterize RCS files. See ci(1) for details.

-zzone Use zone as the time zone for keyword substitution. See co(1) for details.

EXAMPLES

Suppose you have released revision 2.8 of f.c. Assume furthermore that after you complete
an unreleased revision 3.4, you receive updates to release 2.8 from someone else. To
combine the updates to 2.8 and your changes between 2.8 and 3.4, put the updates to 2.8
into file f.c and execute

rcsmerge -p -r2.8 -r3.4 f.c >f.merged.c

Then examine f.merged.c. Alternatively, if you want to save the updates to 2.8 in the RCS
file, check them in as revision 2.8.1.1 and execute co -j:

ci -r2.8.1.1 f.c
co -r3.4 -j2.8:2.8.1.1 f.c

As another example, the following command undoes the changes between revision 2.4 and 2.8
in your currently checked out revision in f.c.

rcsmerge -r2.8 -r2.4 f.c

Note the order of the arguments, and that f.c will be overwritten.

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 overlaps, 1 for some overlaps, 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, 1994, 1995 Paul Eggert.
Copyright © 1982, 1988, 1989 Walter F. Tichy.

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