pstree.x11(1) on Linux
The text a641613e41ed, as Debian 10 (Buster) shipped it.
display a tree of processes
Flags it lists
-
-A -
-G -
-H -
-N -
-S -
-T -
-U -
-V -
-Z -
-a -
-c -
-g -
-h -
-l -
-n -
-p -
-s -
-t -
-u