ipcrm removes one or more messages, semaphores, or shared memory identifiers.

The identifiers are specified by the following options:

-m shmid

Remove the shared memory identifier shmid from the system. The shared memory segment and data structure associated with it are destroyed after the last detach.

-q msqid

Remove the message queue identifier msqid from the system and destroy the message queue and data structure associated with it.

-s semid

Remove the semaphore identifier semid from the system and destroy the set of semaphores and data structure associated with it.

-M shmkey

Removes the shared memory identifier, created with key shmkey, from the system. The shared memory segment and data structure associated with it are destroyed after the last detach.

-Q msgkey

Remove the message queue identifier, created with key msgkey, from the system and destroy the message queue and data structure associated with it.

-S semkey

Remove the semaphore identifier, created with key semkey, from the system and destroy the set of semaphores and data structure associated with it.

The details of the removes are described in msgctl(2), shmctl(2), and semctl(2). Use the ipcs command to find the identifiers and keys.

See environ(5) for descriptions of the following environment variables that affect the execution of ipcrm: LANG, LC_ALL, LC_CTYPE, LC_MESSAGES, and NLSPATH.

See attributes(5) for descriptions of the following attributes:

ipcs(1), msgctl(2), msgget(2), msgrcv(2), msgsnd(2), semctl(2), semget(2), semop(2), shmctl(2), shmget(2), shmop(2), attributes(5), environ(5)