ipcs

Show information about the usage of XSI IPC facilities: shared memory segments, message queues, and semaphore arrays. tldr-pages

On Linux

Several platforms

Show information about all the IPC

ipcs -aIdentify

Show information about active shared memory segments, message queues or semaphore sets

ipcs -mIdentify

Show information on maximum allowable size in bytes

ipcs -bIdentify

Show creator's user name and group name for all IPC facilities

ipcs -cIdentify

Show the pID of the last operators for all IPC facilities

ipcs -pIdentify

Show access times for all IPC facilities

ipcs -tIdentify

Show outstanding usage for active message queues, and shared memory segments

ipcs -oIdentify

Show information about the usage of System V IPC facilities: shared memory segments, message queues, and semaphore arrays.

Show information about all active IPC facilities

Show information about active shared memory segments, message queues or semaphore sets

ipcs --shmemsIdentify

Show full details on the resource with a specific ID

ipcs --shmems --id resource_idIdentify

Show limits in bytes or in a human-readable format

ipcs --limits --bytesIdentify

Show summary about current usage

ipcs --summaryIdentify

Show creator's and owner's UIDs and PIDs for all IPC facilities

ipcs --creatorIdentify

Show the PID of the last operators for all IPC facilities

ipcs --pidIdentify

Show last access times for all IPC facilities

ipcs --timeIdentify