lsipc(1) — Linux manual page


LSIPC(1)                      User Commands                     LSIPC(1)

NAME         top

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

SYNOPSIS         top

       lsipc [options]

DESCRIPTION         top

       lsipc shows information on the System V inter-process
       communication facilities for which the calling process has read

OPTIONS         top

       -i, --id id
           Show full details on just the one resource element 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.

       -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
           Print version and exit.

   Resource options
       -m, --shmems
           Write information about active shared memory segments.

       -q, --queues
           Write information about active message queues.

       -s, --semaphores
           Write information about active semaphore sets.

   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.

           Do not print a header line.

           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         top

           if OK,

           if incorrect arguments specified,

           if a serious error occurs.

HISTORY         top

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

AUTHORS         top

       Ondrej Oprala <>, Karel Zak <>

SEE ALSO         top

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

REPORTING BUGS         top

       For bug reports, use the issue tracker at

AVAILABILITY         top

       The lsipc command is part of the util-linux package which can be
       downloaded from Linux Kernel Archive
       <>. This page
       is part of the util-linux (a random collection of Linux
       utilities) project. Information about the project can be found at
       ⟨⟩. If you have
       a bug report for this manual page, send it to This page was obtained from the
       project's upstream Git repository
       ⟨git://⟩ on
       2024-06-14. (At that time, the date of the most recent commit
       that was found in the repository was 2024-06-10.) 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

util-linux 2.39.594-1e0ad      2023-07-19                       LSIPC(1)

Pages that refer to this page: sysvipc(7)