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RCS (cont)

The co command allows you to check out any version
  • specified by version number e.g.   co -r2.4.1
  • specified by date e.g.   co -d'1-November-2000, 04:00'
It also allows you to embed version information in the file using keywords

$Id$ File name, version number, author, date of creation, etc.
$Log$ The log message from the check-in of this version

Example: 

static char const rcsid[] =
  "$Id: alloc.c,v 1.4 2007/05/09 13:37:10 jas Exp$";