IPCS(1)                           User Commands                          IPCS(1)

       ipcs - show information on IPC facilities

       ipcs [options]

       ipcs shows information on the inter-process communication facilities for
       which the calling process has read access.  By default it shows
       information about all three resources: shared memory segments, message
       queues, and semaphore arrays.

       -i, --id id
              Show full details on just the one resource element identified by
              id.  This option needs to be combined with one of the three
              resource options: -m, -q or -s.

       -h, --help
              Display help text and exit.

       -V, --version
              Display version information and exit.

   Resource options
       -m, --shmems
              Write information about active shared memory segments.

       -q, --queues
              Write information about active message queues.

       -s, --semaphores
              Write information about active semaphore sets.

       -a, --all
              Write information about all three resources (default).

   Output formats
       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(2) and msgrcv(2) operations on message queues,
              the time of the last shmat(2) and shmdt(2) operations on shared
              memory, and the time of the last semop(2) 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.

       ipcmk(1), ipcrm(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 ⟨balasub@cis.ohio-state.edu⟩

       The ipcs command is part of the util-linux package and is available from
       Linux Kernel Archive ⟨https://www.kernel.org/pub/linux/utils/util-

util-linux                          July 2014                            IPCS(1)