Provided by: util-linux_2.20.1-5.1ubuntu20_i386 bug

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  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').

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