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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | NOTES | SEE ALSO | AVAILABILITY | COLOPHON |
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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), sysvipc(7)
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
2020-12-18. (At that time, the date of the most recent commit
that was found in the repository was 2020-12-17.) 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 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), sysvipc(7)
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