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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | NOTES | SEE ALSO | AVAILABILITY | COLOPHON |
IPCRM(1) User Commands IPCRM(1)
ipcrm - remove certain IPC resources
ipcrm [options]
ipcrm {shm|msg|sem} id...
ipcrm removes 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.
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), msgctl(2), and
semctl(2). The identifiers and keys can be found by using ipcs(1).
-a, --all [shm] [msg] [sem]
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.
-Q, --queue-key msgkey
Remove the message queue created with msgkey.
-q, --queue-id msgid
Remove the message queue identified by msgid.
-S, --semaphore-key semkey
Remove the semaphore created with semkey.
-s, --semaphore-id semid
Remove the semaphore identified by semid.
-V, --version
Display version information and exit.
-h, --help
Display help text 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), msgctl(2), msgget(2), semctl(2), semget(2),
shmctl(2), shmdt(2), shmget(2), ftok(3)
The ipcrm command is part of the util-linux package and is available
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
util-linux@vger.kernel.org. This page was obtained from the
project's upstream Git repository
⟨git://git.kernel.org/pub/scm/utils/util-linux/util-linux.git⟩ on
2017-07-05. If you discover any rendering problems in this HTML ver‐
sion 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 man‐
ual page), send a mail to man-pages@man7.org
util-linux July 2014 IPCRM(1)
Pages that refer to this page: ipcmk(1), ipcs(1), lsipc(1), pcp-ipcs(1), svipc(7)