ipcrm

Delete shared memory segment by ID

$ ipcrm -m [shmem_id]

$ ipcrm -M [shmem_key]

$ ipcrm -q [queue_id]

$ ipcrm -Q [queue_key]

$ ipcrm -s [semaphore_id]

$ ipcrm -S [semaphore_key]

$ ipcrm -a

ipcrm [options]

ipcrm removes System V IPC resources (shared memory segments, message queues, and semaphores). Resources can be identified by either their numeric ID or key value.
Use ipcs to list existing resources and their IDs/keys before removal. Resources should be removed when no longer needed to free system resources.

-m, --shmem-id ID

Remove shared memory segment by ID

Remove shared memory segment by key

Remove message queue by ID

Remove message queue by key

Remove semaphore set by ID

Remove semaphore set by key

Remove all IPC resources

Removing resources while processes are still using them can cause those processes to fail. Requires appropriate permissions (owner or root). The -a option removes all accessible resources.

ipcrm has been part of Unix systems since System V IPC was introduced in the early 1980s. It provides essential cleanup functionality for IPC resources that persist beyond process lifetime.

ipcs(1), ipcmk(1), lsipc(1)