hoster() {
  if test "$#" -lt 2; then
    echo "usage: <IP> <HOST_NAME1> [HOST_NAME2] [HOST_NAME3] ..."
    return 1
  fi

  IP=$1
  shift 1
  HOST_FILE=${HOST_FILE:-/etc/hosts}

  test -n "$(echo $OSTYPE | grep '^darwin')" && export IS_MACOS=1

  if test -n "$IS_MACOS"; then
    SED_ARGS='""'
  fi

  (test -z "$NO_SUDO" && type sudo > /dev/null) && export SUDO=sudo

  HOST_NAMES=$*
  for HOST_NAME in $HOST_NAMES
  do
    $SUDO sh -c '
      sed -i '${SED_ARGS}' "/.* '${HOST_NAME}' .*#.*SETTING/d" "'${HOST_FILE}'"
    '
    $SUDO sh -c 'echo "'$IP' '"$HOST_NAME"' # SETTING" >> "'${HOST_FILE}'"'
  done
}