The ipcrm command can be used to remove an IPC object from the kernel. While IPC
objects can be removed via system calls in user code (we'll see how in a moment), the need
often arises, especially under development environments, to remove IPC objects manually. Its
usage is simple:
ipcrm <msg | sem | shm> <IPC ID>
Simply specify whether the object to be deleted is a message queue (msg), a semaphore
set (sem), or a shared memory segment (shm). The IPC ID can be obtained by
the ipcs command. You have to specify the type of object, since identifiers are unique
among the same type (recall our discussion of this earlier).
