grfdiff(1) on Linux
The text 90ccb01cf465, as Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it. The page shows this text now.
A tool to create a binary GRF diff from to GRFs.
Flags it lists
-
-h -
-l -
-n -
-v -
-x -
-y