To include a keyword string you simply include the
relevant text string, such as
$Id$, inside the
file, and commit the file. CVS will automatically
expand the string as part of the commit operation.
It is common to embed the
$Id$ string in
the source files so that it gets passed through to
generated files. For example, if you are managing
computer program source code, you might include a
variable which is initialized to contain that string.
Or some C compilers may provide a
directive. Or a document management system might
provide a way to pass a string through to generated
ident command (which is part of the RCS
package) can be used to extract keywords and their
values from a file. This can be handy for text files,
but it is even more useful for extracting keywords from
$ ident samp.c samp.c: $Id: samp.c,v 1.5 1993/10/19 14:57:32 ceder Exp $ $ gcc samp.c $ ident a.out a.out: $Id: samp.c,v 1.5 1993/10/19 14:57:32 ceder Exp $
SCCS is another popular revision control system.
It has a command,
what, which is very similar to
ident and used for the same purpose. Many sites
without RCS have SCCS. Since
looks for the character sequence
@(#) it is
easy to include keywords that are detected by either
command. Simply prefix the keyword with the
magic SCCS phrase, like this:
static char *id="@(#) $Id: ab.c,v 1.5 1993/10/19 14:57:32 ceder Exp $";
Go to the first, previous, next, last section, table of contents.