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ipcrm(1) - phpMan

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IPCRM(1)                                  User Commands                                  IPCRM(1)

       ipcrm - remove certain IPC resources

       ipcrm [options]

       ipcrm {shm|msg|sem} id...

       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 (specified
       with an initial '0x' or '0X'), or octal (specified with an initial '0').

       -M, --shmem-key shmkey
              Remove the shared memory segment created with shmkey after the last detach is  per‐

       -m, --shmem-id shmid
              Remove  the shared memory segment identified by shmid after the last detach is per‐

       -Q, --queue-key msgkey
              Remove the message queue created with msgkey.

       -q, --queue-id msgid
              Remove the message queue identified by msgid.

       -S, --semaphore-key semkey
              Remove the semaphore created with semkey.

       -s, --semaphore-id semid
              Remove the semaphore identified by semid.

       -a, --all [shm] [msg] [sem]
              Remove all resources.  When an option argument is provided,  the  removal  is  per‐
              formed  only  for the specified resource types.  Warning!  Do not use -a if you are
              unsure how the software using the resources might react to missing  objects.   Some
              programs  create  these resources at startup and may not have any code to deal with
              an unexpected disappearance.

       The details of the removes are described in  shmctl(2),  msgctl(2),  and  semctl(2).   The
       identifiers and keys can be found by using ipcs(1).

       In  its  first  Linux implementation, ipcrm used the deprecated syntax shown in the second
       line of 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.

       ipcs(1),  ipcmk(1),  msgctl(2),  msgget(2),  semctl(2),  semget(2),  shmctl(2),  shmdt(2),
       shmget(2), ftok(3)

       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                                  July 2014                                    IPCRM(1)

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