| ||sccs-comb, comb - combine SCCS deltas
| ||/usr/ccs/bin/comb [-os] [-csid-list] [-psid] s.filename ...
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.
The following options are supported:
- 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
- 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.
- 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.
- The SID of the oldest delta
to be preserved.
- reconstructed SCCS file
- temporary file
for descriptions of the following attributes:
|ATTRIBUTE TYPE||ATTRIBUTE VALUE
sccs(1), sccs-admin(1), sccs-cdc(1), sccs-delta(1), sccs-help(1), sccs-prs(1), sccs-prt(1), sccs-rmdel(1), sccs-sccsdiff(1), what(1), sccsfile(4), attributes(5)
Use the SCCS help
command for explanations (see sccs-help(1)).
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.