With two directories, it prints either the files common to both DIR1
and DIR2 or, with the `not:' prefix, the ones present in DIR1 and not
in DIR2. The `and:' prefix is assumed by default and necessary only if
With two directories, it prints either the files common to both DIR1
and DIR2 or, with the `not:' prefix, the ones present in DIR1 and not
in DIR2. The `and:' prefix is assumed by default and necessary only if