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= lsipc(1)
:doctype: manpage
:man manual: User Commands
:man source: util-linux {release-version}
:page-layout: base
:command: lsipc

== NAME

lsipc - show information on IPC facilities currently employed in the system

== SYNOPSIS

*lsipc* [options]

== DESCRIPTION

*lsipc* shows information on the POSIX and System V inter-process communication facilities for which the calling process has read access.

The default output, as well as the default output from options with predefined output columns (like *--shmems*, etc.), is subject to change. So whenever possible, you should avoid using default outputs in your scripts. Always explicitly define expected columns by using *--output* _columns-list_ in environments where a stable output is required.

== OPTIONS

*-i*, *--id* _id_::
Show full details on just the one resource element (System V) identified by _id_. This option needs to be combined with one of the three resource options: *-m*, *-q* or *-s*. It is possible to override the default output format for this option with the *--list*, *--raw*, *--json* or *--export* option.

*-N*, *--name* _name_::
Show full details on just the one resource element (POSIX) identified by _name_. This option needs to be combined with one of the three resource options: *-M*, *-Q* or *-S*. It is possible to override the default output format for this option with the *--list*, *--raw*, *--json* or *--export* option.

*-g*, *--global*::
Show system-wide usage and limits of IPC resources. This option may be combined with one of the three resource options: *-m*, *-q* or *-s*. The default is to show information about all resources.

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=== Resource options

*-m*, *--shmems*::
Write information about active System V shared memory segments.

*-M*, *--posix-shmems*::
Write information about active POSIX shared memory segments.

*-q*, *--queues*::
Write information about active System V message queues.

*-Q*, *--posix-mqueues*::
Write information about active POSIX message queues.

*-s*, *--semaphores*::
Write information about active System V semaphore sets.

*-S*, *--posix-semaphores*::
Write information about active POSIX named semaphores.

=== Output formatting

*-c*, *--creator*::
Show creator and owner.

*-e*, *--export*::
Produce output in the form of key="value" pairs. All potentially unsafe value characters are hex-escaped (\x<code>). See also option *--shell*.

*-J*, *--json*::
Use the JSON output format.

*-l*, *--list*::
Use the list output format. This is the default, except when *--id* is used.

*-n*, *--newline*::
Display each piece of information on a separate line.

*--noheadings*::
Do not print a header line.

*--notruncate*::
Don't truncate output.

*-o*, *--output* _list_::
Specify which output columns to print. Use *--help* to get a list of all supported columns.

*-b*, *--bytes*::
Print size in bytes rather than in human readable format.

*-r*, *--raw*::
Raw output (no columnation).

*-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.

*--time-format* _type_::
Display dates in short, full or iso format. The default is short, this time format is designed to be space efficient and human readable.

*-P*, *--numeric-perms*::
Print numeric permissions in PERMS column.

*-y*, *--shell*::
The column name will be modified to contain only characters allowed for shell variable identifiers. This is usable, for example, with *--export*. Note that this feature has been automatically enabled for *--export* in version 2.37, but due to compatibility issues, now it's necessary to request this behavior by *--shell*.

== EXIT STATUS

0::
if OK,

1::
if incorrect arguments specified,

2::
if a serious error occurs.

== HISTORY

The *lsipc* utility is inspired by the *ipcs*(1) utility.

== AUTHORS

mailto:ooprala@redhat.com[Ondrej Oprala],
mailto:kzak@redhat.com[Karel Zak]

== SEE ALSO

*ipcmk*(1),
*ipcrm*(1),
*msgrcv*(2),
*msgsnd*(2),
*semget*(2),
*semop*(2),
*shmat*(2),
*shmdt*(2),
*shmget*(2),
*sysvipc*(7)

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