My favorite BASH shell completion of all time is hostname completion for all of my favorite commands:

SSH_COMPLETE=( $(cat ~/.ssh/known_hosts | \
cut -f 1 -d ‘ ‘ | \
sed -e s/,.*//g | \
uniq | \
egrep -v [0123456789]) )

complete -o default -W “${SSH_COMPLETE[*]}” ssh scp sftp rsync nmap traceroute ping nslookup dig host nmap nc

I find most of the hosts I ssh into I use for basic network diagnostics. So performing completion for traceroute, ping, etc based on the contents of known_hosts works great. Just add it to your .bashrc.

Update: 2008/11/04

I’ve modified it to support completion of SVN commands leveraging the hostnames expanded during the SSH completion above:

SVN_COMPLETE=( $(svn -h|grep -e '^ '|awk '{ print $1; }') $SSH_COMPLETE )
complete -o default -W "${SVN_COMPLETE[*]} ${SSH_COMPLETE[*]}" svn

Adding these may lengthen your shell exec tasks.

I test at work. I work from home. But I will not test from home. Fix it yourself. (trademark pending).