Return where a website is hosted, pass -m for mail

gistfile1.sh

function double_host {
  function lookup {
    host $1 | grep 'has address' | host `awk {'print $4'}` | awk {'print $5'} | sed -e 's/[.]$//'
  }

  NUMARGS=$#

  if [ $NUMARGS -eq 1 ]; then
    echo "A Record"
    lookup $1
  else
    if [ "$1" = "-m" ]; then
      echo "Mail Address"
      lookup $(host $2 | grep 'is handled' | host `awk {'print $7'}`)
    else
      echo "Invalid option: $1" >&2
    fi
  fi
}

alias whereis=double_host
# whereis example.com