IPCRM(1) User Commands IPCRM(1)
NAME
ipcrm - remove certain IPC resources
SYNOPSIS
ipcrm [options]
ipcrm [shm|msg|sem] ID ...
DESCRIPTION
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).
OPTIONS
-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.
-h, --help
Display help text and exit.
-V, --version
Print version and exit.
NOTES
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.
SEE ALSO
ipcmk(1), ipcs(1), msgctl(2), msgget(2), semctl(2), semget(2),
shmctl(2), shmdt(2), shmget(2), ftok(3), sysvipc(7)
REPORTING BUGS
For bug reports, use the issue tracker at
https://github.com/util-linux/util-linux/issues.
AVAILABILITY
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/>.
util-linux 2.38.1 2022-05-11 IPCRM(1)
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