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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  information  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 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() 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.

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

       -b, --bytes
              Print sizes in bytes.

       --human
              Print sizes in human-readable format.

SEE ALSO
       ipcrm(1),   ipcmk(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 utility.  The Linux  ver‐
       sion  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.

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 ⟨ftp://ftp.kernel.org/pub/linux/utils/util-linux/⟩.

util-linux                                  July 2014                                     IPCS(1)

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