pnmcrop(1) on Linux
The text ca42b52a7312, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze), Debian 5.0 (Lenny), Debian 4.0 (Etch), Debian 3.1 (Sarge), Debian 3.0 (Woody) shipped it.
crop a portable anymap
Flags it lists
-
-black -
-bottom -
-left -
-right -
-sides -
-top -
-verbose -
-white