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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | NOTES | SEE ALSO | REPORTING BUGS | AVAILABILITY |
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IPCRM(1) User Commands IPCRM(1)
ipcrm - remove certain IPC resources
ipcrm [options]
ipcrm [shm|msg|sem] ID ...
ipcrm removes POSIX and System V inter-process communication (IPC)
objects and associated data structures from the system. In order
to delete such objects, you must be superuser, or the creator or
owner of the object.
POSIX and System V IPC objects are of three types: shared memory,
message queues, and semaphores. Deletion of a message queue or
semaphore object is immediate (regardless of whether any process
still holds an IPC identifier for the object). A shared memory
object is only removed after all currently attached processes have
detached (shmdt(2)) the object from their virtual address space.
Two syntax styles are supported. The old Linux historical syntax
specifies a three-letter keyword indicating which class of object
is to be deleted, followed by one or more IPC identifiers for
objects of this type.
The SUS-compliant syntax allows the specification of zero or more
objects of all three types in a single command line, with objects
specified either by key or by identifier (see below). Both keys
and identifiers may be specified in decimal, hexadecimal
(specified with an initial '0x' or '0X'), or octal (specified with
an initial '0').
The details of the removes are described in shmctl(2),
shm_unlink(3), msgctl(2), mq_unlink(3), semctl(2), and
sem_unlink(3). The identifiers and keys can be found by using
lsipc(1) or ipcs(1).
-a, --all [shm] [pshm] [msg] [pmsg] [sem] [psem]
Remove all resources. When an option argument is provided, the
removal is performed only for the specified resource types.
Warning! Do not use -a if you are unsure how the software
using the resources might react to missing objects. Some
programs create these resources at startup and may not have
any code to deal with an unexpected disappearance.
-M, --shmem-key shmkey
Remove the shared memory segment created with shmkey after the
last detach is performed.
-m, --shmem-id shmid
Remove the shared memory segment identified by shmid after the
last detach is performed.
-x, --posix-shmem name
Remove the POSIX shared memory segment created with name.
-Q, --queue-key msgkey
Remove the message queue created with msgkey.
-q, --queue-id msgid
Remove the message queue identified by msgid.
-y, --posix-mqueue name
Remove the POSIX message queue created with name.
-S, --semaphore-key semkey
Remove the semaphore created with semkey.
-s, --semaphore-id semid
Remove the semaphore identified by semid.
-z, --posix-semaphore name
Remove the POSIX named semaphore created with name.
-h, --help
Display help text and exit.
-V, --version
Display version and exit.
In its first Linux implementation, ipcrm used the deprecated
syntax shown in the second line of the SYNOPSIS. Functionality
present in other *nix implementations of ipcrm has since been
added, namely the ability to delete resources by key (not just
identifier), and to respect the same command-line syntax. For
backward compatibility the previous syntax is still supported.
ipcmk(1), ipcs(1), lsipc(1), msgctl(2), mq_unlink(3), msgget(2),
semctl(2), semget(2), sem_unlink(3), shmctl(2), shmdt(2),
shmget(2), shm_unlink(3), ftok(3), sysvipc(7)
For bug reports, use the issue tracker
<https://github.com/util-linux/util-linux/issues>.
The ipcrm 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/>. This page is
part of the util-linux (a random collection of Linux utilities)
project. Information about the project can be found at
⟨https://www.kernel.org/pub/linux/utils/util-linux/⟩. If you have a
bug report for this manual page, send it to
[email protected]. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2025-08-11. (At that time, the date of the most recent commit that
was found in the repository was 2025-08-05.) 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 [email protected]
util-linux 2.42-start-521-ec46 2025-08-09 IPCRM(1)
Pages that refer to this page: ipcmk(1), ipcs(1), lsipc(1), pcp-ipcs(1), sysvipc(7)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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