ipcs

IPCS(1)                          User Commands                         IPCS(1)

NAME
       ipcs - show information on IPC facilities

SYNOPSIS
       ipcs [options]

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

OPTIONS
       -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 re-
              source 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.

   Representation
       These affect only the -l (--limits) option.

       -b, --bytes
              Print sizes in bytes.

       --human
              Print sizes in human-readable format.

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

CONFORMING TO
       The Linux ipcs utility is not fully compatible to the POSIX ipcs  util-
       ity.   The  Linux  version does not support the POSIX -a, -b and -o op-
       tions, 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.

AUTHOR
       Krishna Balasubramanian <balasub@cis.ohio-state.edu>

AVAILABILITY
       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-
       linux/>.

util-linux                         July 2014                           IPCS(1)