ipcs shows the status of SYSV inter process communication facilities.
$ ipcs -s
------ Semaphore Arrays --------
key semid owner perms nsems
0xdd3adabd 0 fernape 600 1
I had forgotten about this command but I remembered it when we ran out of semaphores in our Linux system two days ago.
Other way of getting the same information is to cat the following files:
$ ls /proc/sysvipc
msg sem shm
Enjoy!
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