ipcrm [ shm | msg | sem ] id ...
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).
|removes the shared memory segment created with shmkey after the last detach is performed.|
|removes the shared memory segment identified by shmid after the last detach is performed.|
|removes the message queue created with msgkey.|
|removes the message queue identified by msgid.|
|removes the semaphore created with semkey.|
|removes the semaphore identified by semid.|