IPCS(1) User Commands IPCS(1)
ipcs – show information on IPC facilities
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.
Display help text and exit.
Display version information and exit.
Write information about active shared memory segments.
Write information about active message queues.
Write information about active semaphore sets.
Write information about all three resources (default).
Of these options only one takes effect: the last one specified.
Show creator and owner.
Show resource limits.
Show PIDs of creator and last operator.
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 sema‐
Show status summary.
These affect only the -l (–limits) option.
Print sizes in bytes.
Print sizes in human-readable format.
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
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
Krishna Balasubramanian ⟨email@example.com⟩
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-
util-linux July 2014 IPCS(1)