ipcrm man page on ElementaryOS

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IPCRM(1)			 User Commands			      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 identi‐
       fier 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 spec‐
       ifies  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 spec‐
       ified either by key or by identifier. (See below.)  Both keys and iden‐
       tifiers may be specified in decimal,  hexadecimal  (specified  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 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 implementa‐
       tions 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/.

util-linux			  March 2002			      IPCRM(1)
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