sem(1) on Linux
The text 0652a54ca9e2, as Debian 7 (Wheezy) shipped it.
semaphore for executing shell command lines in parallel
Flags it lists
-
--bg -
--fg -
--id -
--jobs -
--max-procs -
--semaphorename -
--wait -
-N -
-P -
-j -
-w