xbiff(1x) on Linux
The text 8aa7133a4c3d, as Debian 2.0 (Hamm), Debian 1.3 (Bo), Debian 1.1 (Buzz) shipped it.
mailbox flag for X
Flags it lists
-
-bd -
-bg -
-bw -
-display -
-fg -
-file -
-geometry -
-help -
-rv -
-shape -
-update -
-volume -
-xrm