Bashscripts.org

I want to know how to handle logins in bash since I am not sure if I am not sure if I can send it to background.

So basically I need to sign in to SSH (open a tunnel) and then get a cvs login. I wonder if there is a method on how to handle this multi-proceses.


and on a different terminal



NOTE: the cvs login si not within the tunnel but originally done on an outside window.

Hi jza!

There are a couple of ways you can do this:

1 - You can fork SSH to the background with the "-f" and "-N" flags

2 - You can start the tunnel in a 'screen' session

This link has some suggestions for doing something similar to what it sounds like you're trying:

http://www.g-loaded.eu/2006/11/24/auto- ... h-tunnels/

so you'd want to do something like this:



Of course, this leaves that tunnel open in the background, so you'd probably want to get the pid of that ssh session and kill it at the end of the script.

Hope this helps!

This would be cool but my question will remain for doing a double authentication, so if I shoot the ssh command to one window and the cvs to another I will still need to switch back and forth to provide the required authentication. right?

BTW your other option did work althought I still need to read about killing the tunnel after.

Hmm... there's a couple of ways to do that too

Option 1: A Timer



(Note that we leave off the '-N' option) The timer will keep the tunnel open for 10 seconds by itself, but the tunnel shouldn't close until after your cvs command finishes. After the cvs command finishes, the tunnel should close automagically. I haven't tested this one yet, but it's based on one of the examples in that link I posted before. Looks like the cleanest option!

Option 2: Capture the pid, kill when finished



The problem with option 2 is it tends to leave the tunnel port occupied until it times out, so it's kind of a dirty way to do it. I think Option 1 is the best way to go, and I learned several new things trying to figure it out!

Hope it helps!
-jeo