#!/bin/bash

NUM_DAYS="0"
TODAY_CODE=$(echo "$(date +%s) / 86400" | bc)

for i in $(cat /etc/passwd | awk -F':' '{print $1}')
do

last | grep ${i} > /dev/null 2>&1

if [ $? -eq 0 ]
then

DATE_TEXT=$(last | grep ${i} | head -1 | awk '{print $5" "$6}')
DATE_CODE=$(echo "$(date -d"${DATE_TEXT}" +%s) / 86400" | bc)
DIFF_DAYS=$(echo "${TODAY_CODE} - ${DATE_CODE}" | bc)

if [ ${DIFF_DAYS} -ge ${NUM_DAYS} ]
then

echo "${i} - ${DIFF_DAYS}"

fi

fi

done