gifflip(1) on Linux
The text 30a5d14d9979, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it. The page shows this text now.
A program to flip (mirror) GIF file along X or Y axes, or rotate the GIF file 90 degrees to the left or to the right.