losetup(8) on Linux
The text 261cdc93784d, as Debian 4.0 (Etch) shipped it.
set up and control loop devices
Flags it lists
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-C -
-F -
-G -
-H -
-I -
-K -
-R -
-S -
-T -
-a -
-d -
-e -
-o -
-p -
-r -
-s -
-v