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FreeBSD 11.0 - man page for ipcrm (freebsd section 1)

IPCRM(1)						    BSD General Commands Manual 						  IPCRM(1)

NAME
ipcrm -- remove the specified message queues, semaphore sets, and shared segments
SYNOPSIS
ipcrm [-W] [-v] [-q msqid] [-m shmid] [-s semid] [-Q msgkey] [-M shmkey] [-S semkey] ...
DESCRIPTION
The ipcrm utility removes the specified message queues, semaphores and shared memory segments. These System V IPC objects can be specified by their creation ID or any associated key. The following options are generic: -v If specified once with -W or with -1 for an object, it will show all removed objects. If specified twice with -W or with -1 for an objects, it will show all removed objects and all failed removals. -W Try to wipe all specified message queues, semaphores and shared memory segments. -y Use the kvm(3) interface instead of the sysctl(3) interface to extract the required information. If ipcrm is to operate on the run- ning system, using kvm(3) will require read privileges to /dev/kmem. The following options are used to specify which IPC objects will be removed. Any number and combination of these options can be used: -q msqid Remove the message queue associated with the ID msqid from the system. -m shmid Mark the shared memory segment associated with ID shmid for removal. This marked segment will be destroyed after the last detach. -s semid Remove the semaphore set associated with ID semid from the system. -Q msgkey Remove the message queue associated with key msgkey from the system. -M shmkey Mark the shared memory segment associated with key shmkey for removal. This marked segment will be destroyed after the last detach. -S semkey Remove the semaphore set associated with key semkey from the system. The identifiers and keys associated with these System V IPC objects can be determined by using ipcs(1). If the identifier or the key is -1, it will remove all these objects.
SEE ALSO
ipcs(1)
HISTORY
The wiping of all System V IPC objects was first implemented in FreeBSD 6.4 and 7.1.
AUTHORS
The original author was Adam Glass. The wiping of all System V IPC objects was thought up by Callum Gibson and extended and implemented by Edwin Groothuis.
BSD
December 12, 2007 BSD