ipcmk:tldr:f0481

The command "ipcmk --queue" is used to create an inter-process communication (IPC) message queue in a Unix-like operating system. IPC is a mechanism that allows multiple processes to communicate with each other by sharing data or sending messages.

In this specific command, "ipcmk" is the utility used to create an IPC object, and "--queue" specifies that the type of IPC object being created is a message queue.

A message queue is a data structure that holds a collection of messages, each with a specific priority and message type. It allows processes to send and receive messages asynchronously, meaning the sender and receiver do not need to be actively running at the same time.

When the "ipcmk --queue" command is executed, it will create a new message queue and allocate system resources to manage it. The command may also return a unique identifier (often referred to as a message queue key or ID) for the newly created queue, which can be used by other processes to access and utilize the same queue for communication purposes.

Once created, the message queue can be manipulated and accessed by other processes using specific IPC commands, such as "msgget" to retrieve the message queue identifier, "msgsnd" to send a message to the queue, and "msgrcv" to receive a message from the queue.