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Using screen is a great way to leave long-running processes churning away when you’re not logged into the machine.

Open a new screen

screen

Detach from the screen

This does not interrupt whatever is running in the screen.

Press Ctrl-A then D.

Reattach to a screen you’ve already opened

screen -r

If you’ve opened multiple screens, a list will be displayed:

There are several suitable screens on:
	1681.ttys004.braeburn	(Detached)
	1686.ttys004.braeburn	(Detached)

Just use the process ID of the screen to resume the right one:

screen -r 1681