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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 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  com-
       mand  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 ini-
       tial '0').


OPTIONS
       -M shmkey
              removes the shared memory segment created with shmkey after the last detach is performed.

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

       -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 command-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-ng    package    and    is    available   from
       ftp://ftp.kernel.org/pub/linux/utils/util-linux-ng/.



ipcrm                     last change: 19 March 2002                  IPCRM(1)