setsid

setsid is a command line tool commonly found in Unix-like operating systems. It is used to execute a command in a new session, detach it from the current terminal, and prevent it from being terminated if the terminal session is closed. The setsid command allows a process to continue running independently of the controlling terminal.

When setsid is invoked, it creates a new session and acts as its leader. Any command executed using setsid is attached to this session and becomes independent of the controlling terminal. This means that the command can continue running even if the terminal is closed or the user logs out.

One of the main use cases of setsid is to execute long-running processes that should not be interrupted. For example, running a server application or a background task that needs to persist even if the user ends their terminal session.

The setsid command is often used in combination with other commands, such as nohup, to further enhance the disconnection between the command and the terminal. By using setsid, a process can be fully detached from the terminal session, allowing it to run in the background without any interference.

Overall, setsid is a useful tool for managing long-running processes and ensuring they are not tied to the current terminal session. It provides a way to create independent sessions and detach commands, allowing them to run unaffected by the state of the terminal.