gphelp(1) on Linux
The text 6d283b0a888f, as Debian 8 (Jessie) shipped it.
GP-PARI online help script
Flags it lists
-
-cb -
-ch -
-color_bold -
-color_help -
-color_underline -
-cu -
-detex -
-k -
-raw -
-to_pod