ipcrm is a Unix and Linux command which will mark System V interprocess communication API kernel entities for removal. Actual removal is deferred until the last connected process has detached.

System V IPC kernel entities are:

• Shared memory (interprocess communication) segments
• Message queues
• Semaphore arrays

On Linux, the ipcrm command is provided by the util-linux package.

The ipcrm command has also been ported to the IBM i operating system.^[1]

• List of Unix commands
• ipcs – provide information on ipc facilities