COMB(CP) XENIX System V COMB(CP)
Name
comb - Combines SCCS deltas.
Syntax
comb [-o] [-s] [-psid] [-clist] files
Description
comb provides the means to combine one or more deltas in an
SCCS file and make a single new delta. The new delta
replaces the previous deltas, making the SCCS file smaller
than the original.
comb does not perform the combination itself. Instead, it
generates a shell procedure that you must save and execute
to reconstruct the given SCCS files. comb copies the
generated shell procedure to the standard output. To save
the procedure, you must redirect the output to a file. The
saved file can then be executed like any other shell
procedure (see sh(C)).
When invoking comb, arguments may be specified in any order.
All options apply to all named SCCS files. If a directory
is named, comb behaves as though each file in the directory
were specified as a named file, except that nonSCCS files
(last component of the pathname does not begin with s.) and
unreadable files are silently ignored. If a name of - is
given, the standard input is read; each line of the standard
input is taken to be the name of an SCCS file to be
processed; nonSCCS files and unreadable files are silently
ignored.
The options are as follows. Each is explained as though
only one named file is to be processed, but the effects of
any option apply independently to each named file.
-pSID The SCCS IDentification string (SID) of the oldest
delta to be preserved. All older deltas are
discarded in the reconstructed file.
-clist A list (see get(CP) for the syntax of a list) of
deltas to be preserved. All other deltas are
discarded.
-o For each get -e generated, this argument causes the
reconstructed file to be accessed at the release of
the delta to be created, otherwise the reconstructed
file would be accessed at the most recent ancestor.
Use of 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.
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COMB(CP) XENIX System V COMB(CP)-s This argument causes comb to generate a shell
procedure that will produce a report for each file
giving the filename, size (in blocks) after
combining, original size (also in blocks), and
percentage change computed by:
100 * (original - combined) / original
Before any SCCS files are actually combined, you should use
this option to determine exactly how much space is saved by
the combining process.
If no options are specified, comb will preserve only leaf
deltas and the minimal number of ancestors needed to
preserve the tree.
Files
comb????? Temporary files
See Also
admin(CP), delta(CP), get(CP), help(CP), prs(CP),
sccsfile(F)
Diagnostics
Use help(CP) for explanations.
Notes
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 be larger than the original.
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