Ipcs
Encyclopedia
The ipcs command will list System V
interprocess communication API kernel entities to stdout
Standard streams
In Unix and Unix-like operating systems , as well as certain programming language interfaces, the standard streams are preconnected input and output channels between a computer program and its environment when it begins execution...

.
System V IPC kernel entities are:
  • Shared memory
    Shared memory
    In computing, shared memory is memory that may be simultaneously accessed by multiple programs with an intent to provide communication among them or avoid redundant copies. Depending on context, programs may run on a single processor or on multiple separate processors...

     segments
  • Message queue
    Message queue
    In computer science, message queues and mailboxes are software-engineering components used for interprocess communication, or for inter-thread communication within the same process. They use a queue for messaging – the passing of control or of content...

    s
  • Semaphore
    Semaphore (programming)
    In computer science, a semaphore is a variable or abstract data type that provides a simple but useful abstraction for controlling access by multiple processes to a common resource in a parallel programming environment....

    arrays
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