comb - combine SCCS deltas
comb [ -o ][ -s ][ -p sid][ -c list] files
comb generates a shell procedure [see sh(1)] which, when run, will
reconstruct the given SCCS files. The reconstructed files will,
hopefully, be smaller than the original files. The arguments may be
specified in any order, but all keyletter arguments 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 non-SCCS files
(last component of the path name 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 input is taken to be the name of an SCCS file
to be processed; non-SCCS files and unreadable files are silently
ignored. The generated shell procedure is written on the standard
The keyletter arguments are as follows. Each is explained as though only
one named file is to be processed, but the effects of any keyletter
argument apply independently to each named file.
-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 keyletter may decrease the size of
the reconstructed SCCS file. It may also alter the shape of the
delta tree of the original file.
-s This argument causes comb to generate a shell procedure which, when
run, will produce a report giving, for each file: the file name,
size (in blocks) after combining, original size (also in blocks),
and percentage change computed by:
100 * (original - combined) / original
It is recommended that before any SCCS files are actually combined,
one should use this option to determine exactly how much space is
saved by the combining process.
The CCS IDentification string (SID) of the oldest delta to be
preserved. All older deltas are discarded in the reconstructed
-c list A
list (see get(1) for the syntax of a list) of deltas to be
preserved. All other deltas are discarded.
If no keyletter arguments are specified, comb will preserve only leaf
deltas and the minimal number of ancestors needed to preserve the tree.
s.COMB The name of the reconstructed SCCS file.
admin(1), delta(1), get(1), help(1), prs(1), sh(1), sccsfile(4)
Use help(1) for explanations.
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.
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