ipcrm
removes System V IPC resources
TLDR
Delete shared memory segment by ID
$ ipcrm -m [shmem_id]
Delete shared memory segment by key$ ipcrm -M [shmem_key]
Delete message queue by ID$ ipcrm -q [queue_id]
Delete message queue by key$ ipcrm -Q [queue_key]
Delete semaphore by ID$ ipcrm -s [semaphore_id]
Delete semaphore by key$ ipcrm -S [semaphore_key]
Delete all IPC resources$ ipcrm -a
SYNOPSIS
ipcrm [options]
DESCRIPTION
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.
PARAMETERS
-m, --shmem-id ID
Remove shared memory segment by ID-M, --shmem-key KEY
Remove shared memory segment by key-q, --queue-id ID
Remove message queue by ID-Q, --queue-key KEY
Remove message queue by key-s, --semaphore-id ID
Remove semaphore set by ID-S, --semaphore-key KEY
Remove semaphore set by key-a, --all
Remove all IPC resources
CAVEATS
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.
HISTORY
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.
