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IPCRM(1) User Commands IPCRM(1)
NAME
ipcrm - remove a message queue, semaphore set or shared memory id
SYNOPSIS
ipcrm [options]
ipcrm {shm|msg|sem} id...
DESCRIPTION
ipcrm removes System V interprocess communication (IPC) objects and associated data struc-
tures 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 (speci-
fied with an initial '0x' or '0X'), or octal (specified with an initial '0').
OPTIONS
-M, --shmem-key shmkey
removes the shared memorysegment created with shmkey after the last detach is per-
formed.
-m, --shmem-id shmid
removes the shared memory segment identified by shmid after the last detach is per-
formed.
-Q, --queue-key msgkey
removes the message queue created with msgkey.
-q, --queue-id msgid
removes the message queue identified by msgid.
-S, --semaphore-key semkey
removes the semaphore created with semkey.
-s, --semaphore-id semid
removes the semaphore identified by semid.
-a, --all [shm msg sem]
Remove all resources. When option argument is provided the removal is performed
only to for the specified resource types. Warning! Do not use -a if you are unsure
how the software using resources might react on missing objects. Some programs cre-
ate these resources at start up and may not have any code to deal unexpected disap-
pearance.
The details of the removes are described in msgctl(2), shmctl(2), and semctl(2). The
identifiers and keys may be found by using ipcs(1).
NOTES
In its first Linux implementation, ipcrm used the deprecated syntax shown in 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 com-
mand-line syntax. For backward compatibility the previous syntax is still supported.
SEE ALSO
ipcs(1), ipcmk(1), msgctl(2), msgget(2), semctl(2), semget(2), shmctl(2), shmdt(2),
shmget(2), ftok(3)
AVAILABILITY
The ipcrm command is part of the util-linux package and is available from Linux Kernel
Archive <ftp://ftp.kernel.org/pub/linux/utils/util-linux/>.
util-linux September 2011 IPCRM(1)
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Under GNU General Public License
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