zsh

bash

Hitting tab to complete commands and filenames is great. Extending this to hostnames is even better. (Does it show that I'm very lazy?) One way of doing this is to switch to theshell, which does this and a bunch of other stuff by default. Happily, though, if you'd rather stick with, all is not lost.One way to get the most out of bash's programmable parameter completion is to set up hostname completion. Here's how to code it yourself.

bash has programmable parameter completion, so you could set hostname completion up by coding it yourself. That's not necessary, though. Instead, you can pick up the bash completion files (also available as the bash-completion package in RH, Debian and from Darwin Ports for Mac OS X).

Once you've installed that, type:

. /etc/bash_completion

/opt/local/etc/bash_completion

~/.bashrc

~/.bash_profile

ssh

(path on a Mac is). Add this to yourorto load it automatically on startup. Now, try typingand a couple of letters of a machine you often ssh to, then hit Tab. Bingo! You'll get either a list of options, or, if there's only one option available, the name filled in, just like with the tab-completion you're already used to.

This takes information from your .ssh/known_hosts file. It works automatically for ssh and similar commands, but you can also set other commands to use it. For example, maybe you have a script called 'update' which updates a particular host. Type:

complete -F _known_hosts update

and you should now be able to tab-complete hosts with that, as well. (If you have problems, try specifying its full path.)