Cf. Debian bug http://bugs.debian.org/540460
Package: diff
Version: 2.8.1-13
Severity: wishlist

Please add new option -z, --compress to support compressed files.
An example:

   # locate program's original manual

   $ whereis program
   program: /usr/bin/program /usr/share/man/man1/program.1.gz

   # From a version control checkout, what has changed?

   cd /usr/src/versin-control/program.cvs
   diff -u -z progam.1  /usr/share/man/man1/program.1.gz

Jari


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