The bash completion file I'm using for ssh and scp

ssh.bash

##
# Complete SSH with known hosts or configured hosts
##
_complete_ssh_hosts ()
{
        COMPREPLY=()
        cur="${COMP_WORDS[COMP_CWORD]}"
        comp_ssh_hosts=$(if [ -f ~/.ssh/known_hosts ]; then
                        cat ~/.ssh/known_hosts | \
                        cut -f 1 -d ' '  | \
                        sed -e s/,.*//g | \
                        grep -v ^# | \
                        uniq | \
                        grep -v "\[" ;
                fi
                if [ -f ~/.ssh/config ]; then
                        cat ~/.ssh/config | \
                        grep "^Host " | \
                        awk '{print $NF}'
                fi
        )
        COMPREPLY=( $(compgen -W "${comp_ssh_hosts}" -- $cur))
        return 0

        echo "$comp_ssh_hosts"
}

# Auto-complete with,
# * file names,
# * entries from hostfile,
# * results of _complete_ssh_hosts
complete \
        -A file \
        -A hostname \
        -F _complete_ssh_hosts \
        ssh scp