post_install() {
  groupadd -g 55 nut &> /dev/null
  useradd -u 55 -g nut -G tty -d /var/state/ups -s /bin/false nut >/dev/null 2>&1
  mkdir -p /var/state/ups/
  chmod 0770 /var/state/ups/
  chown root:nut /var/state/ups/
  chown root:nut /etc/ups/upsd.conf /etc/ups/upsd.users /etc/ups/upsmon.conf
  echo ">>> Before starting your UPSd daemon, it is imperative"
  echo ">>> that you read through and edit where needed these files:"
  echo ">>> /etc/ups/{ups.conf,upsd.conf,upsmon.conf,upsd.users}"
  echo ">>>"
  echo ">>> Then add the the upsd service:"
  echo ">>> $ sudo add_service.sh upsd"
}

pre_remove() {
  remove_service.sh upsd
  userdel nut >/dev/null 2>&1
  groupdel nut >/dev/null 2>&1
  rm -rf /var/state/ups/
}