xstdcmap(1) on Linux
The text 5d5669b7c0a6, as Debian 11 (Bullseye), Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
X standard colormap utility
Flags it lists
-
-all -
-best -
-blue -
-default -
-delete -
-display -
-gray -
-green -
-help -
-red -
-verbose -
-version