sccs-comb(1)

NAME
sccs-comb, comb - combine SCCS deltas

SYNOPSIS

/usr/ccs/bin/comb
[-os]
[-c
sid-list]
[-p
sid]
s.filename...

DESCRIPTION

comb generates a shell script (see sh(1)) that you can use to reconstruct the indicated s.files. This script is written to the standard output.

If a directory name is used in place of the s.filename argument, the comb command applies to all s.files in that directory. Unreadable s.files produce an error; processing continues with the next file (if any). The use of `-' as the s.filename argument indicates that the names of files are to be read from the standard input, one s.file per line.

If no options are specified, comb preserves only the most recent (leaf) delta in a branch, and the minimal number of ancestors needed to preserve the history.

OPTIONS

The following options are supported:

-o  For each `get -e' generated, access the reconstructed file at the release of the delta to be created. Otherwise, the reconstructed file is accessed at the most recent ancestor. The use of -o may decrease the size of the reconstructed s.file. It may also alter the shape of the delta tree of the original file.

-s  Generate scripts to gather statistics, rather than combining deltas. When run, the shell scripts report: the file name, size (in blocks) after combining, original size (also in blocks), and the percentage size change, computed by the formula:

    100 * ( original - combined ) / original

    This option can be used to calculate the space that will be saved, before actually doing the combining.

-csid-list
    Include the indicated list of deltas. All other deltas are omitted. sid-list is a comma-separated list of SCCS delta IDs (SIDs). To specify a range of deltas, use a `-' separator instead of a comma, between two SIDs in the list.

-pSID
    The SID of the oldest delta to be preserved.

-V  Prints the comb version number string and exists.

ENVIRONMENT VARIABLES

See environ(5) for descriptions of the following environment variables that affect the execution of comb(1): LANG, LC_ALL, LC_COLLATE, LC_CTYPE, LC_MESSAGES, and NLSPATH.

SCCS_NO_HELP
    If set, comb(1) will not automatically call help(1) with the SCCS error code in order to print a more helpful error message. Scripts that depend on the exact error messages of SCCS commands should set the environment variable SCCS_NO_HELP and set LC_ALL=C.

EXIT STATUS

The following exit values are returned:

0   Successful completion.

1   An error occurred.

FILES

s.COMB
    reconstructed SCCS file

comb?????
    temporary file

ATTRIBUTES

See attributes(5) for descriptions of the following attributes:

SEE ALSO

sccs(1), sccs-admin(1), sccs-cdc(1), sccs-delta(1), sccs-get(1), sccs-help(1), sccs-prs(1), sccs-prt(1), sccs-rmdel(1), sccs-sact(1), sccs-sccsdiff(1), sccs-unget(1), sccs-val(1), sccscvt(1), sccslog(1), bdiff(1), diff(1), what(1), changeset(4), sccsfile(4), attributes(5), environ(5), standards(5).

DIAGNOSTICS

Use the SCCS help command for explanations (see sccs-help(1)).

BUGS

comb may rearrange the shape of the tree of deltas. It may not save any space; in fact, it is possible for the reconstructed file to actually be larger than the original.

AUTHORS
The SCCS suite was origininally written by Marc J. Rochkind at Bell Labs in 1972. Release 4.0 of SCCS, introducing new versions of the programs admin(1), get(1), prt(1), and delta(1) was published on February 18, 1977; it introduced the new text based SCCS v4 history file format (previous SCCS releases used a binary history file format). The SCCS suite was later maintained by various people at AT&T and Sun Microsystems. Since 2006, the SCCS suite is maintained by Joerg Schilling.