09-26-2001
ipcs simply reports information on IPC resources.
There is no "command line" way to change the values for the
IPC resources (and there shouldn't be). Depending on the
system you are running, you may be able just to change the
system tunable parameter values and reboot. On other systems
however, you may have to edit the system tunable parameters
and rebuild your kernel. This procedure is extremly system/OS
dependent and not recommended if you are new to UNIX.
You can render your system unbootable if you make a mistake
(or at the very least, hose up system performance). If nobody
but you relies or accesses the system then feel free to
expierement but be ready to do alot of reading.
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IPCS(1) User Commands IPCS(1)
NAME
ipcs - provide information on IPC facilities
SYNOPSIS
ipcs [resource-option] [output-format]
ipcs [resource-option] -i id
DESCRIPTION
ipcs provides information on the inter-process communication facilities for which the calling process has read access.
OPTIONS
-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.
Resource options
-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).
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 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 <ftp://ftp.kernel.org/pub/linux/utils/util-
linux/>.
util-linux January 2013 IPCS(1)