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October 21, 2009

SSH Tip for the Day

by @ 8:14 am. Filed under bash, command-line, Linux tips, ssh tips

When you are forwarding ports through a tunnel, either locally or remotely (i.e., with the -L or -R switches), you can modify the session real-time. The way that you do this is after you start the session, you press SHIFT + ` + c (The ` key also has a ~ in it, which is the actual keypress sent to the session). If it doesn’t work the first time, press ENTER a couple of times and try it again. Once you get the “ssh>” prompt, type “?” for the commands you can put in. Here’s an example session:

[0908][scott@dev:~]$ ssh -R 8080:suseblog.com:8080 scott@suseblog.com
Password:
Last login: Thu Oct 15 11:59:43 2009 from 67.214.232.162
Have a lot of fun...
[1109][scott@mail:~]$ [PRESS SHIFT + ` + c HERE]
ssh> ?
Commands:
      -L[bind_address:]port:host:hostport    Request local forward
      -R[bind_address:]port:host:hostport    Request remote forward
      -KR[bind_address:]port                 Cancel remote forward
[PRESS ENTER HERE]
[1110][scott@mail:~]$ [PRESS SHIFT + ` + c HERE]
ssh> -R8080:letslearnlinux.com:1080
Forwarding port.

[1110][scott@mail:~]$

OpenSSH has got to be one of the freakin’ sweetest tools *EVAR*. Anyway, enjoy!

2 Responses to “SSH Tip for the Day”

  1. Mark Waite Says:

    I agree! The OpenSSH project of OpenBSD has done a great service to the community for the last 10 years. They recently celebrated the tenth anniversary of the project with the release of OpenSSH 5.3. http://www.openssh.com/txt/release-5.3 Thanks to the programmers mentioned at http://www.openssh.org/history.html.

  2. Scott Morris Says:

    Thanks for the comment, Mark. OpenSSH++ Thanks for stopping by!

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