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


speak up

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