comb(1) 						      General Commands Manual							   comb(1)

NAME

       comb - combine SCCS deltas

SYNOPSIS

       SID] list] file ...

DESCRIPTION

       The  command  generates a shell procedure (see sh(1)) which, when run, reconstructs the given SCCS files.  The reconstructed files are usu-
       ally smaller than the original files.  Arguments can be specified in any order, but all options apply to all named SCCS files.  If a direc-
       tory  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	standard  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 output.

   Options
       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 discarded in the recon-
			     structed file.

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

	      For each	     generated, this option causes the reconstructed file to be accessed at the release of the delta to be created, other-
			     wise  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 computed by:

				  100 x (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 process.

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

EXTERNAL INFLUENCES

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

DIAGNOSTICS

       Use sccshelp(1) for explanations.

EXAMPLES

       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:

WARNINGS

       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.

FILES

       Temporary file

       Temporary file

SEE ALSO

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

																	   comb(1)