comb man page on HP-UX

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comb(1)								       comb(1)

       comb - combine SCCS deltas

       SID] list] file ...

       The  command  generates	a shell procedure (see sh(1)) which, when run,
       reconstructs the given SCCS files.  The reconstructed files are usually
       smaller	than  the  original  files.  Arguments can be specified in any
       order, but all options 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 that non-SCCS files (last component of the path
       name does not begin with and unreadable files are silently ignored.  If
       a name of is given, the standard input is read; each line of the	 stan‐
       dard  input  is	taken  to be the name of an SCCS file to be processed;
       non-SCCS files and unreadable files are silently ignored.   The	gener‐
       ated shell procedure is written on the standard output.

       recognizes  the	following  options.   Each is explained as if only one
       named file is to be processed, but the  effects	of  any	 option	 apply
       independently to each named file.

	      The	     SCCS  IDentification  string  (SID) of the oldest
			     delta to be preserved.  All older deltas are dis‐
			     carded in the reconstructed file.

	      A		     list  of  deltas  to be preserved (see get(1) for
			     the syntax of a list).  All other deltas are dis‐

	      For each	     generated,	 this  option 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  option can decrease the size of the
			     reconstructed SCCS file.  It can also  alter  the
			     shape of the delta tree of the original file.

	      This option causes
			     to	 generate  a  shell procedure which, when run,
			     produces a report giving, for each file: the file
			     name,  size (in blocks) after combining, original
			     size (also in blocks), and percentage change com‐
			     puted by:

				  100 × (original − combined) / original

			     It is recommended that this option be used before
			     any SCCS files are actually combined to determine
			     exactly  how much space is saved by the combining

       If no options are specified, preserves only leaf deltas and the minimal
       number of ancestors needed to preserve the tree.

   International Code Set Support
       Single- and multi-byte character code sets are supported.

       Use sccshelp(1) for explanations.

       The command:

       creates	a  shell  script  named which if executed, creates a new using
       only the deltas from the old The script overwrites  the	old  thus,  it
       might  be  wise	to copy the original elsewhere.	 Here is an example of
       typical technique:

       may rearrange the shape of the tree of deltas.  Combining files may  or
       may  not save space; in fact, it is possible for the reconstructed file
       to actually be larger than the original.

       Temporary file

       Temporary file

       admin(1), delta(1), get(1), sccshelp(1), prs(1), sh(1), sccsfile(4).


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