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IPCS(1) User Commands IPCS(1)

ipcs - provide information on IPC facilities

ipcs [resource-option] [output-format]
ipcs [resource-option] -i id

ipcs provides information on the inter-process communication facilities for which the calling process has read access.

-i, --id id
Print details only on the resource identified by id.
-h, --help
Display a help text and exit.
-V, --version
Display version information and exit.

-q, --queues
Write information about active message queues.
-m, --shmems
Write information about active shared memory segments.
-s, --semaphores
Write information about active semaphore sets.
-a, --all
Write information about all three resources (default).

Of these options only one takes effect: the last one specified.
-c, --creator
Show creator and owner.
-l, --limits
Show resource limits.
-p, --pid
Show PIDs of creator and last operator.
-t, --time
Write time information. The time of the last control operation that changed the access permissions for all facilities, the time of the last msgsnd() and msgrcv() operations on message queues, the time of the last shmat() and shmdt() operations on shared memory, and the time of the last semop() operation on semaphores.
-u, --summary
Show status summary.

These affect only the -l (--limits) option.
-b, --bytes
Print sizes in bytes.
Print sizes in human-readable format.

ipcrm(1), ipcmk(1), msgrcv(2), msgsnd(2), semget(2), semop(2), shmat(2), shmdt(2), shmget(2)

The Linux ipcs utility is not fully compatible to the POSIX ipcs utility. The Linux version does not support the POSIX -a, -b and -o options, but does support the -l and -u options not defined by POSIX. A portable application shall not use the -a, -b, -o, -l, and -u options.

Krishna Balasubramanian

The ipcs command is part of the util-linux package and is available from Linux Kernel Archive.
January 2013 util-linux

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