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I'm using Linux a lot, but I'm confused with it. Maybe it is stupid question, but whatever. I'v logged in xterm to remote host by ssh. Now on the remote host i started command (rsync, a lot of data is copied from one disk to another). I forgot to run this command in screen. What happens when i close xterm ? Running command terminate or not ?

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Yes, it does.

When you kill xterm, it kills ssh (unless you specifically instructed it to detach) which, in turn, terminates connection and thus the remote shell, which kills rsync.

You could have prevented the trouble by using screen, tmux, or nohup.

You can also use ps to figure out whether the process is running or lsof to figure out whether someone is reading or writing to a particular file (which rsync is supposed to be copying).

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