SSH Completion for bash based on .ssh/config file

ssh_completion

__from_ssh_config() {
  SSHCONFIG=$HOME/.ssh/config
  COMPREPLY=()
  local cur=${COMP_WORDS[COMP_CWORD]}
  COMPREPLY=($(compgen -W '$(cat ~/.ssh/config | grep Host | cut -d" " -f2-)' -- $cur))
}

complete -F __from_ssh_config -o default ssh

save this somewhere and add the following to your profile

if [-f /path/to/ssh_completion/ ]; then
. /path/to/ssh_completion
fi

This will autocomplete the ssh command for any host you have defined in your .ssh/config file