Suppose you receive mail from firstname.lastname@example.org asking for an update from release 1.2 to 1.4 of the tc compiler. You have no such patches on hand, but with CVS that can easily be fixed with a command such as this:
$ cvs rdiff -c -r FOO1_2 -r FOO1_4 tc | \ $$ Mail -s 'The patches you asked for' email@example.com
Suppose you have made release 1.3, and forked a branch called `R_1_3fix' for bugfixes. `R_1_3_1' corresponds to release 1.3.1, which was made some time ago. Now, you want to see how much development has been done on the branch. This command can be used:
$ cvs patch -s -r R_1_3_1 -r R_1_3fix module-name cvs rdiff: Diffing module-name File ChangeLog,v changed from revision 18.104.22.168 to 22.214.171.124 File foo.c,v changed from revision 126.96.36.199 to 188.8.131.52 File bar.h,v changed from revision 184.108.40.206 to 1.2
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