fuser(1) on Linux
The text 1b6f2910caaa, as Debian 3.0 (Woody) shipped it.
identify processes using files or sockets
Flags it lists
-
-4 -
-6 -
-V -
-a -
-i -
-k -
-l -
-m -
-n -
-s -
-signal -
-u -
-v