ssh-host

#!/bin/bash
#

help() {
   echo 'usage: ssh-host [host]'
   echo
   echo '    Host lookup inside ~/.ssh/config. If no host'
   echo '    is given then output the whole ~/.ssh/config file.'
   echo
   echo '    This script is most useful together with bash'
   echo '    completion:'
   echo
   echo '        _ssh_host()'
   echo '        {'
   echo '            local cur prev words cword'
   echo '            _init_completion -n = || return'
   echo '            _known_hosts_real -a -F ~/.ssh/config "$cur"'
   echo '        } && complete -F _ssh_host ssh-host'
   echo
   exit 1
}

[ "$1" == "--help" ] && help

[ "$1" == "" ] && cat ~/.ssh/config

host="$1"

IFS=$'\n'
matched=no
for i in `cat ~/.ssh/config`
do
    if [ "$matched" == "yes" ]; then

	if [[ "$i" =~ ^HostName\  ]]; then
	    echo "$i" | sed 's/HostName *//'
            break
	fi
    elif [[ "$i" =~ ^Host\ *$host ]]; then
        matched=yes
    fi
done