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Is it possible to:

  1. execute sftp command on remote machine and download a file (ssh user@machine, sftp user2@server, get file)
  2. then, send download to background, so I can turn my local computer off
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Please correct me if i'm wrong: 1)You are connected locally on machine A. 2)You want to connect through SSH on machine B. 3)On B's shell, you want to execute a remote sftp download from machine C. 4)You then want do shutdown machine A. Is that correct? –  Pavlos G. Dec 13 '10 at 15:48
    
A - my local computer; B - remote server 1; C - remote server 2; I want to type ssh user@B on my A machine, then sftp user@C and get some_file.tar.gz on B machine; so, I would like to sftp download a file from C to B and shut down my A machine, leaving remote B and C running –  Paweł Karpiński Dec 13 '10 at 15:54

4 Answers 4

up vote 7 down vote accepted

Try screen on machine B, start the download and detach afterwards:

On machine A:

ssh user@B

On machine B:

screen
sftp user@C
get some_file.tar.gz
Ctrl-a d
logout

Never tried but could work.

Edit: later, log back in and use screen -x to reconnect to the running session. Then, shut it down properly so that it isn't consuming the server's resources.

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it works! thanks a lot :) extremely useful command... –  Paweł Karpiński Dec 13 '10 at 16:08
    
and for a funkier screen on ubuntu, try out byobu. –  finley Dec 23 '10 at 12:25

If you just want the "detach" feature of screen, there's a program called "dtach" that provides only that feature.

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Putting the character & (ampersand) behind a command runs it in background. However, I don't know how to do it after a command has already been executed, nor do I know whether this works on remote machines.

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& would be OK, but I don't know any --password option I can pass through command line (so I can't do something like sftp --password=abc user@server:file.tar.gz &) –  Paweł Karpiński Dec 13 '10 at 15:57

There are a number of solutions to this issue.

One option is to use the screen command, however seems a little complex.

The best way I have found is sending the job to the background.

In your case the command would be

scp user@machine:~/filename.ext /tmp &
scp -r user@machine:~/dirname /tmp &
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