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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXIT STATUS | HISTORY | AUTHORS | SEE ALSO | REPORTING BUGS | AVAILABILITY |
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LSIPC(1) User Commands LSIPC(1)
lsipc - show information on IPC facilities currently employed in
the system
lsipc [options]
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.
-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.
-h, --help
Display help text and exit.
-V, --version
Display version and exit.
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.
0
if OK,
1
if incorrect arguments specified,
2
if a serious error occurs.
The lsipc utility is inspired by the ipcs(1) utility.
Ondrej Oprala <ooprala@redhat.com>, Karel Zak <kzak@redhat.com>
ipcmk(1), ipcrm(1), msgrcv(2), msgsnd(2), semget(2), semop(2),
shmat(2), shmdt(2), shmget(2), sysvipc(7)
For bug reports, use the issue tracker
<https://github.com/util-linux/util-linux/issues>.
The lsipc command is part of the util-linux package which can be
downloaded from Linux Kernel Archive
<https://www.kernel.org/pub/linux/utils/util-linux/>. This page is
part of the util-linux (a random collection of Linux utilities)
project. Information about the project can be found at
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have a
bug report for this manual page, send it to
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2025-08-11. (At that time, the date of the most recent commit that
was found in the repository was 2025-08-05.) If you discover any
rendering problems in this HTML version of the page, or you
believe there is a better or more up-to-date source for the page,
or you have corrections or improvements to the information in this
COLOPHON (which is not part of the original manual page), send a
mail to man-pages@man7.org
util-linux 2.42-start-521-ec46 2025-08-09 LSIPC(1)
Pages that refer to this page: ipcmk(1), ipcrm(1), sysvipc(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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