The ipcs command will list System V InterProcess Communication System`s API kernel entities to stdout. System V IPC kernel entities are: ==Linux== The ipcs command is provided by the util-linux package. NAME ipcs - provide information on ipc facilities SYNOPSIS ipcs [ -asmq ] [ -tclup ] ipcs [ -smq ] -i id ipcs -h DESCRIPTION ipcs provides inform.... Found on http://en.wikipedia.org/wiki/Ipcs