pmmessage(1) on Linux
The text a5f7e960fd31, as Debian 10 (Buster) shipped it.
general purpose dialog box
Flags it lists
-
-B -
-b -
-buttons -
-c -
-center -
-default -
-exclusive -
-file -
-font -
-geometry -
-header -
-icon -
-nearmouse -
-noframe -
-noprint -
-noslider -
-print -
-t -
-timeout -
-useslider