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<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.

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) utility.

AUTHORS

       Ondrej Oprala <ooprala@redhat.com>, Karel Zak <kzak@redhat.com>

SEE ALSO

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

REPORTING BUGS

       For bug reports, use the issue tracker <https://github.com/util-linux/util-linux/issues>.

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/>.

util-linux 2.41                                    2025-03-04                                           LSIPC(1)