lsof(8) on Linux
The text 9fe4a2d333ed, as Debian 11 (Bullseye) shipped it.
list open files
Flags it lists
-
-- -
-? -
-C -
-N -
-O -
-P -
-R -
-U -
-V -
-X -
-a -
-b -
-h -
-l -
-n -
-o -
-t -
-v