util-linux/sys-utils/lsipc.1

'\" t
.\"     Title: lsipc
.\"    Author: [see the "AUTHOR(S)" section]
.\" Generator: Asciidoctor 2.0.20
.\"      Date: 2025-03-04
.\"    Manual: User Commands
.\"    Source: util-linux 2.41
.\"  Language: English
.\"
.TH "LSIPC" "1" "2025-03-04" "util\-linux 2.41" "User Commands"
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.SH "NAME"
lsipc \- show information on IPC facilities currently employed in the system
.SH "SYNOPSIS"
.sp
\fBlsipc\fP [options]
.SH "DESCRIPTION"
.sp
\fBlsipc\fP shows information on the POSIX and System V inter\-process communication facilities for which the calling process has read access.
.sp
The default output, as well as the default output from options with predefined output columns (like \fB\-\-shmems\fP, etc.), is subject to change. So whenever possible, you should avoid using default outputs in your scripts. Always explicitly define expected columns by using \fB\-\-output\fP \fIcolumns\-list\fP in environments where a stable output is required.
.SH "OPTIONS"
.sp
\fB\-i\fP, \fB\-\-id\fP \fIid\fP
.RS 4
Show full details on just the one resource element (System V) identified by \fIid\fP. This option needs to be combined with one of the three resource options: \fB\-m\fP, \fB\-q\fP or \fB\-s\fP. It is possible to override the default output format for this option with the \fB\-\-list\fP, \fB\-\-raw\fP, \fB\-\-json\fP or \fB\-\-export\fP option.
.RE
.sp
\fB\-N\fP, \fB\-\-name\fP \fIname\fP
.RS 4
Show full details on just the one resource element (POSIX) identified by \fIname\fP. This option needs to be combined with one of the three resource options: \fB\-M\fP, \fB\-Q\fP or \fB\-S\fP. It is possible to override the default output format for this option with the \fB\-\-list\fP, \fB\-\-raw\fP, \fB\-\-json\fP or \fB\-\-export\fP option.
.RE
.sp
\fB\-g\fP, \fB\-\-global\fP
.RS 4
Show system\-wide usage and limits of IPC resources. This option may be combined with one of the three resource options: \fB\-m\fP, \fB\-q\fP or \fB\-s\fP. The default is to show information about all resources.
.RE
.sp
\fB\-h\fP, \fB\-\-help\fP
.RS 4
Display help text and exit.
.RE
.sp
\fB\-V\fP, \fB\-\-version\fP
.RS 4
Display version and exit.
.RE
.SS "Resource options"
.sp
\fB\-m\fP, \fB\-\-shmems\fP
.RS 4
Write information about active System V shared memory segments.
.RE
.sp
\fB\-M\fP, \fB\-\-posix\-shmems\fP
.RS 4
Write information about active POSIX shared memory segments.
.RE
.sp
\fB\-q\fP, \fB\-\-queues\fP
.RS 4
Write information about active System V message queues.
.RE
.sp
\fB\-Q\fP, \fB\-\-posix\-mqueues\fP
.RS 4
Write information about active POSIX message queues.
.RE
.sp
\fB\-s\fP, \fB\-\-semaphores\fP
.RS 4
Write information about active System V semaphore sets.
.RE
.sp
\fB\-S\fP, \fB\-\-posix\-semaphores\fP
.RS 4
Write information about active POSIX named semaphores.
.RE
.SS "Output formatting"
.sp
\fB\-c\fP, \fB\-\-creator\fP
.RS 4
Show creator and owner.
.RE
.sp
\fB\-e\fP, \fB\-\-export\fP
.RS 4
Produce output in the form of key="value" pairs. All potentially unsafe value characters are hex\-escaped (\(rsx<code>). See also option \fB\-\-shell\fP.
.RE
.sp
\fB\-J\fP, \fB\-\-json\fP
.RS 4
Use the JSON output format.
.RE
.sp
\fB\-l\fP, \fB\-\-list\fP
.RS 4
Use the list output format. This is the default, except when \fB\-\-id\fP is used.
.RE
.sp
\fB\-n\fP, \fB\-\-newline\fP
.RS 4
Display each piece of information on a separate line.
.RE
.sp
\fB\-\-noheadings\fP
.RS 4
Do not print a header line.
.RE
.sp
\fB\-\-notruncate\fP
.RS 4
Don\(cqt truncate output.
.RE
.sp
\fB\-o\fP, \fB\-\-output\fP \fIlist\fP
.RS 4
Specify which output columns to print. Use \fB\-\-help\fP to get a list of all supported columns.
.RE
.sp
\fB\-b\fP, \fB\-\-bytes\fP
.RS 4
Print size in bytes rather than in human readable format.
.RE
.sp
\fB\-r\fP, \fB\-\-raw\fP
.RS 4
Raw output (no columnation).
.RE
.sp
\fB\-t\fP, \fB\-\-time\fP
.RS 4
Write time information. The time of the last control operation that changed the access permissions for all facilities, the time of the last \fBmsgsnd\fP(2) and \fBmsgrcv\fP(2) operations on message queues, the time of the last \fBshmat\fP(2) and \fBshmdt\fP(2) operations on shared memory, and the time of the last \fBsemop\fP(2) operation on semaphores.
.RE
.sp
\fB\-\-time\-format\fP \fItype\fP
.RS 4
Display dates in short, full or iso format. The default is short, this time format is designed to be space efficient and human readable.
.RE
.sp
\fB\-P\fP, \fB\-\-numeric\-perms\fP
.RS 4
Print numeric permissions in PERMS column.
.RE
.sp
\fB\-y\fP, \fB\-\-shell\fP
.RS 4
The column name will be modified to contain only characters allowed for shell variable identifiers. This is usable, for example, with \fB\-\-export\fP. Note that this feature has been automatically enabled for \fB\-\-export\fP in version 2.37, but due to compatibility issues, now it\(cqs necessary to request this behavior by \fB\-\-shell\fP.
.RE
.SH "EXIT STATUS"
.sp
0
.RS 4
if OK,
.RE
.sp
1
.RS 4
if incorrect arguments specified,
.RE
.sp
2
.RS 4
if a serious error occurs.
.RE
.SH "HISTORY"
.sp
The \fBlsipc\fP utility is inspired by the \fBipcs\fP(1) utility.
.SH "AUTHORS"
.sp
.MTO "ooprala\(atredhat.com" "Ondrej Oprala" ","
.MTO "kzak\(atredhat.com" "Karel Zak" ""
.SH "SEE ALSO"
.sp
\fBipcmk\fP(1),
\fBipcrm\fP(1),
\fBmsgrcv\fP(2),
\fBmsgsnd\fP(2),
\fBsemget\fP(2),
\fBsemop\fP(2),
\fBshmat\fP(2),
\fBshmdt\fP(2),
\fBshmget\fP(2),
\fBsysvipc\fP(7)
.SH "REPORTING BUGS"
.sp
For bug reports, use the \c
.URL "https://github.com/util\-linux/util\-linux/issues" "issue tracker" "."
.SH "AVAILABILITY"
.sp
The \fBlsipc\fP command is part of the util\-linux package which can be downloaded from \c
.URL "https://www.kernel.org/pub/linux/utils/util\-linux/" "Linux Kernel Archive" "."