Published at LXer:
The nohup command executes another command specifies as its argument and ignores all SIGHUP (hangup) signals. SIGHUP is a signal that is sent to a process when its controlling terminal is closed. Normally when you run a command over SSH if your connection drops, or you log out the SSH session is terminated and all the commands executed from the terminal will stop. This is where the nohup command comes handy. It will ignore all hangup signals and commands will continue to run.
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