comb(1) [ultrix man page]
comb(1) General Commands Manual comb(1) Name comb - combine delta versions of SCCS file Syntax comb [-o] [-s] [-psid] [-clist] files Description The command generates a shell procedure which, when run, will reconstruct the given SCCS files. For further information, see The recon- structed files are generally 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, behaves as though each file in the directory were specified as a named file, except non-SCCS files (last component of the path name does not begin with s.) and unreadable files, which 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. The generated shell procedure is written on the standard output. Each keyletter argument 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. Options -clist Preserves specified deltas. See for the syntax of a list. All other deltas are discarded. -o 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. -pSID Indicates oldest delta to be preserved. All older deltas are discarded in the reconstructed file. -s Generates a shell procedure which produces a report. This report gives 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. If no keyletter arguments are specified, will preserve only leaf deltas and the minimal number of ancestors needed to preserve the tree. Restrictions The command 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. Diagnostics See for explanations. Files s.COMB The name of the reconstructed SCCS file. comb????? Temporary. See Also admin(1), delta(1), get(1), help(1), prs(1), sccs(1), sccsfile(5) Guide to the Source Code Control System comb(1)
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comb(1) General Commands Manual comb(1) NAME
comb - Combines Source Code Control System (SCCS) deltas SYNOPSIS
comb [-clist] [-os] [-pSID] file... The comb command writes to standard output a shell procedure for combining 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 created 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 gen- erate 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 com- bining 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)