--- name: "lsipc" section: "1" platform: "linux" package: "util-linux" version: "2.42.4-1" release: "Arch Linux 2026-11-01" platforms: ["linux"] url: "https://new.carta.tech/lsipc" --- # lsipc(1) show information on IPC facilities currently employed in the system ## 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. - **-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\). 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)](/msgsnd/2.md) and [**msgrcv**(2)](/msgrcv/2.md) operations on message queues, the time of the last [**shmat**(2)](/shmat/2.md) and [**shmdt**(2)](/shmdt/2.md) operations on shared memory, and the time of the last [**semop**(2)](/semop/2.md) 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 **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 0 if OK, 1 if incorrect arguments specified, 2 if a serious error occurs. ## HISTORY The **lsipc** utility is inspired by the [**ipcs**(1)](/ipcs/1.md) utility. ## AUTHORS *Ondrej Oprala* \, *Karel Zak* \ ## SEE ALSO [**ipcmk**(1)](/ipcmk/1.md), [**ipcrm**(1)](/ipcrm/1.md), [**msgrcv**(2)](/msgrcv/2.md), [**msgsnd**(2)](/msgsnd/2.md), [**semget**(2)](/semget/2.md), [**semop**(2)](/semop/2.md), [**shmat**(2)](/shmat/2.md), [**shmdt**(2)](/shmdt/2.md), [**shmget**(2)](/shmget/2.md), [**sysvipc**(7)](/sysvipc/7.md) ## REPORTING BUGS For bug reports, use the *issue tracker* \. ## AVAILABILITY The **lsipc** command is part of the util-linux package which can be downloaded from *Linux Kernel Archive* \.