lsof(8) on Linux
The text 912d9d04a951, as Debian 6.0 (Squeeze) shipped it.
list open files
Flags it lists
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-- -
-? -
-C -
-N -
-O -
-P -
-R -
-U -
-V -
-X -
-a -
-b -
-h -
-l -
-n -
-o -
-t -
-v -
-x