gifclrmp(1) on Linux
The text fc4d756117a7, as Debian 4.0 (Etch), Debian 3.1 (Sarge), Debian 3.0 (Woody) shipped it.
Program to modify GIF image colormaps.
Flags it lists
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-g -
-h -
-i -
-l -
-q -
-s -
-t