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 identi
fier. (See below.) Both keys and identifiers may be spec
ified 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
just identifier), and to respect the same command-line
syntax. For backward compatibility the previous syntax is
still supported.
SEE ALSO
ipcs(8), msgctl(2), msgget(2), semctl(2), semget(2),
shmctl(2), shmdt(2), shmget(2), ftok(3)
ipcrm last change: 19 March 2002 IPCRM(8)
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