pnmcomp(1) on Linux
The text e1a3f875939a, 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.
composite (overlay) two portable anymap files together
Flags it lists
-
-align -
-invert -
-valign -
-xoff -
-yoff