comb(1)comb(1)NAMEcomb - Combines Source Code Control System (SCCS) deltas
SYNOPSIScomb [-clist] [-os] [-pSID] file...
The comb command writes to standard output a shell procedure for com‐
bining the specified deltas (SIDs) of an SCCS file and creating a new
version of the file with fewer deltas.
OPTIONS
Each option or group of options applies independently to each named
file. Specifies a list of deltas (SIDs) that the shell procedure will
preserve (see get -ilist). The procedure will combine all other deltas.
Accesses the reconstructed file at the release of the delta to be cre‐
ated for each get -e generated; otherwise, accesses the reconstructed
file at the most recent ancestor. Using the -o option may decrease the
size of the reconstructed SCCS file. It may also alter the shape of
the delta tree of the original file. Specifies the SID of the oldest
delta for the resulting procedure to preserve. All older deltas are
combined in the reconstructed file. Causes comb to generate a shell
procedure that, instead of combining the deltas, produces a report for
each file, which lists the file name, size (in blocks) after combining,
original size (also in blocks), and percentage change computed by the
following formula: 100 * (original - combined) / original
Run comb using this option before actually combining SCCS deltas
in order to judge how much space will actually be saved by the
combining process.
DESCRIPTION
By piping the output of the comb command to a shell, or redirecting the
output to a file and running that file as a shell procedure, you can
reduce the size of your SCCS file. You can first see how much the file
will be reduced by running the comb command with the -s option.
If you specify a directory in place of file, the comb command performs
the requested actions on all SCCS files (that is, those with file names
with the s. prefix). If you specify a - (dash) in place of file, the
comb command reads standard input and interprets each line as the name
of an SCCS file. The comb command continues to take input until it
reads End-of-File.
If you do not specify any options, the comb command preserves only leaf
deltas and the minimal number of ancestors needed to preserve the tree
(see the delta command).
The comb command may rearrange the shape of the tree deltas.
The comb command may not save any space; in fact, it is possible for
the reconstructed file to actually be larger than the original.
EXAMPLES
To generate a report on how much space will be saved by combing all
deltas older than SID 1.4 for SCCS file s.test.c, enter: comb-p1.4-s
s.test.c | sh To actually combine the deltas, enter: comb-p1.4
s.test.c | sh
FILES
Temporary files.
SEE ALSO
Commands: admin(1), cdc(1), delta(1), get(1), prs(1), rmdel(1),
sact(1), sccs(1), sccsdiff(1), sccshelp(1), unget(1), val(1), what(1)
Files: sccsfile(4)
Programming Support Tools
comb(1)
