ssh « Coherent Ramblings

2008/03/24

SSH tab completion

Filed under: Quick Tips, Tools — Tags: ssh — plathrop @ 9:57 am

This is awesome. Put the following into your ~/.bash_profile file:

complete -W "$(echo `cat ~/.ssh/known_hosts | cut -f 1 -d ' ' \
| sed -e s/,.*//g | uniq | grep -v "\["`;)" ssh

Open a new shell and type ssh tab tab. I love tab completion, don’t you?

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2008/02/23

Useful SSH-isms

Filed under: Quick Tips — Tags: ssh — plathrop @ 2:53 pm

Two useful SSH-isms

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2008/02/14

Simple SSH speed-up

Filed under: Quick Tips — Tags: ssh — plathrop @ 4:00 pm

I just discovered something that is very simple but saves a significant amount of time. Specifically, the SSH ControlMaster feature, which allows you to re-use an existing SSH connection whenever you connect to a host you are already connected to.

In your ~/.ssh/config file, add:

Host *
        ControlMaster auto
        ControlPath /tmp/%r@%h:%p

Whenever you connect to server.example.com as user joeuser, SSH will create a named pipe at /tmp/joeuser@server.example.com:22. If you open another connection to the same server (as the same user), instead of creating a new TCP/IP connection, SSH will automatically multiplex the new session with the existing connection (through the named pipe)! This reduces time spent setting up new connections. Although this usual only saves a couple of seconds per connection, I’m constantly opening several simultaneous sessions; this will definitely add up to a significant savings over the long term!

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