comb(1)								      comb(1)

  comb - Combines Source Code Control System (SCCS) deltas


  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.


  Each flag or group of flags 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 del-

  -o  Accesses the reconstructed file at the release of the delta to be
      created for each get -e generated; otherwise, accesses the recon-
      structed file at the most recent ancestor.  Using the -o flag 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.

  -s  Causes comb to generate a shell procedure that, instead of combining
      the deltas, produces a report for each file, which lists the filename,
      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 flag before actually combining SCCS deltas in order
      to judge how much space will actually be saved by the combining pro-


  By piping the output of comb 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 run-
  ning comb with the -s flag.

  If you specify a directory in place of file, comb performs the requested
  actions on all SCCS files (that is, those with filenames with the s. pre-
  fix).	 If you specify a - (dash) in place of file, comb reads standard
  input and interprets each line as the name of an SCCS file.  comb continues
  to take input until it reads End-of-File.

  If you do not specify any flags, comb preserves only leaf deltas and the
  minimal number of ancestors needed to preserve the tree (see the delta com-

  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.


   1.  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

   2.  To actually combine the deltas, enter:
	    comb -p1.4 s.test.c | sh



  comb$$     Temporary files.


  Commands:  admin(1), cdc(1), delta(1), get(1), prs(1), rmdel(1), sact(1),
  sccsdiff(1), sccshelp(1), unget(1), val(1), what(1).

  Files:  sccsfile(4).