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(2) and msgrcv(2) operations on message queues, the time of the last shmat(2) and shmdt(2) operations on shared  mem-
	      ory, 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 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.

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)