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IPCRM(1)			    Linux Programmer's Manual				 IPCRM(1)

NAME
       ipcrm - remove a message queue, semaphore set or shared memory id

SYNOPSIS
       ipcrm [ -M key | -m id | -Q key | -q id | -S key | -s id ] ...

       deprecated usage

       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 shmkey
	      removes the shared memory segment created with shmkey after the last detach is per-
	      formed.

       -m shmid
	      removes the shared memory segment identified by shmid after the last detach is per-
	      formed.

       -Q msgkey
	      removes the message queue created with msgkey.

       -q msgid
	      removes the message queue identified by msgid.

       -S semkey
	      removes the semaphore created with semkey.

       -s semid
	      removes the semaphore identified by semid.

       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
       ftp://ftp.kernel.org/pub/linux/utils/util-linux/.

ipcrm				    last change: 19 March 2002				 IPCRM(1)
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