GNU screen is something every UNIX user should have in his/her toolbox for everyday work.
It is a utility that allow for multiple text consoles on a single terminal (be it xterm,
iTerm or a physical console) with:
- cut & paste between all of them
- independant scrollable history
- dynamic creation/destruction of consoles
but there is more (and where the real value of screen is):
you can detach and re-attach at any time.
That means that you can have long-time running tasks in separate consoles (like ssh on a remmote machine, IRC sessions, ...)
on a given machine, detach from the session, move from one physical location to another, connect to the machine through ssh and
re-attach to the screen session to keep on working. No need to re-login, re-connect or anything.
That’s brilliant.
More information here

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