xbiff(1x) on Linux
The text 80a7be449664, as Debian 2.2 (Potato), Debian 2.1 (Slink) shipped it.
mailbox flag for X
Flags it lists
-
-bd -
-bg -
-bw -
-display -
-fg -
-file -
-geometry -
-help -
-rv -
-shape -
-update -
-volume -
-xrm