Screen
screen is a nice tool that can be
used to detach long-running processes from the current SSH session - and be able
to get them back again!
Basic usage
You start it with
$ screen
You detach it with Ctrl + a and then d. After you have pressed this key combination, you will see
[detached]
You get it back again with:
$ screen -r
Named sessions
You can start a named session with
$ screen -S foo
and get it back with
$ screen -r foo
nohup
$ nohup command &