#!/bin/bash

cd "$(dirname "$0")/.."
FILE=${1:-'/etc/shadow'}
EXITSTATUS=0

while read entry; do
  login=$(echo $entry | cut -d: -f1)
  expiration=$(echo $entry | cut -d: -f8)

  if [ -z "$expiration" ]; then
    echo $login: does not have an expiration date
    let "EXITSTATUS++"
  fi
done < "$FILE"

exit $EXITSTATUS