pamtogif(1) on Linux
The text 5a454d8c962c, as Debian 13 (Trixie), Debian 12 (Bookworm) shipped it.
convert a Netpbm image to a GIF image
Flags it lists
-
-alphacolor -
-aspect -
-comment -
-interlace -
-mapfile -
-noclear -
-nolzw -
-sort -
-transparent -
-verbose