start an ssh session in a new tmux window

tssh.sh

#!/bin/bash 

if [ $# -eq 0 ] || [ $# -gt 1 ];
then
  echo "usage: r [username]@hostname"
  exit
fi

input="$*"

case "$*" in
  *\@*)
    user="${input%%\@*}"
    host="${input##*@}"
    tmux new-window -n "${host}" ssh "${user}@${host}"
    ;;
  *)
    host="${input}"
    tmux new-window -n ${host} ssh "${host}"
esac