ipcs — Report Interprocess Communication Facilities Status
/usr/bin/ipcs [-aAbcimopqst][-C corefile][-N namelist]
The ipcs command prints information about active interprocess communication facilities. The information that is displayed is controlled by the options you supply. Without options, information is printed in short format for message queues, shared memory, and semaphores that are currently active in the system, as shown in the following example.
castle% ipcs IPC status from <running system> as of Tue Jan 19 17:16:05 1999 Message Queue facility not in system. T ID KEY MODE OWNER GROUP Shared Memory: m 0 0x50018325 ...