LSIPC(1) User Commands LSIPC(1) # [NAME](#NAME) lsipc - show information on IPC facilities currently employed in the system # [SYNOPSIS](#SYNOPSIS) **lsipc** \[options] # [DESCRIPTION](#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](#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. **-h**, **--help** Display help text and exit. **-V**, **--version** Display version and exit. ## [Resource options](#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](#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)](/man/os/util-linux/msgsnd.2) and [**msgrcv**(2)](/man/os/util-linux/msgrcv.2) operations on message queues, the time of the last [**shmat**(2)](/man/os/util-linux/shmat.2) and [**shmdt**(2)](/man/os/util-linux/shmdt.2) operations on shared memory, and the time of the last [**semop**(2)](/man/os/util-linux/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**. # [ENVIRONMENT](#ENVIRONMENT) **LIBSMARTCOLS\_DEBUG**=all enables libsmartcols debug output. **LIBSMARTCOLS\_DEBUG\_PADDING**=on use visible padding characters. **LIBSMARTCOLS\_JSON**=compact|lines Controls JSON output format when using **--json**. Supported values are **compact** for JSON output with minimal whitespace, and **lines** for JSON Lines format (one JSON object per line). If unset or set to any other value, pretty-printed JSON is used. # [EXIT STATUS](#EXIT_STATUS) 0 if OK, 1 if incorrect arguments specified, 2 if a serious error occurs. # [HISTORY](#HISTORY) The **lsipc** utility is inspired by the [**ipcs**(1)](/man/os/util-linux/ipcs.1) utility. # [AUTHORS](#AUTHORS) *Ondrej Oprala* <ooprala@redhat.com>, *Karel Zak* <kzak@redhat.com> # [SEE ALSO](#SEE_ALSO) [**ipcmk**(1)](/man/os/util-linux/ipcmk.1), [**ipcrm**(1)](/man/os/util-linux/ipcrm.1), [**msgrcv**(2)](/man/os/util-linux/msgrcv.2), [**msgsnd**(2)](/man/os/util-linux/msgsnd.2), [**semget**(2)](/man/os/util-linux/semget.2), [**semop**(2)](/man/os/util-linux/semop.2), [**shmat**(2)](/man/os/util-linux/shmat.2), [**shmdt**(2)](/man/os/util-linux/shmdt.2), [**shmget**(2)](/man/os/util-linux/shmget.2), [**sysvipc**(7)](/man/os/util-linux/sysvipc.7) # [REPORTING BUGS](#REPORTING_BUGS) For bug reports, use the *issue tracker* <https://github.com/util-linux/util-linux/issues>. # [AVAILABILITY](#AVAILABILITY) 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/>. 2026-10-19 util-linux 2.42.4 --- Document: lsipc(1) from util-linux 2.42.4-r1 (Chainguard OS)