gphelp(1) on Linux
The text d5bfc28daa87, as Debian 3.0 (Woody) shipped it.
GP-PARI online help script
Flags it lists
-
-cb -
-ch -
-color_bold -
-color_help -
-color_underline -
-cu -
-detex -
-k -
-raw -
-to_pod