bash file change detector

bash file change detector.sh

modified_info=/var/log/eb-docker/containers/eb-current-app/unexpected-quit.log.meta
log=/var/log/eb-docker/containers/eb-current-app/unexpected-quit.log
if [ ! -f $modified_info ]; then
     _date=$(stat -c %y "$log")
     echo $_date >> $modified_info
     exit 0
fi

last_modification_date=$(awk '/./{line=$0} END{print line}' $modified_info)
now_date=$(stat -c %y "$log")
if [ -z "${last_modification_date}" ]
then
  echo $now_date >> $modified_info
  exit 0
fi

if [[ $now_date != $last_modification_date ]]
then
  echo "changed!"
  echo $now_date >> $modified_info
else
  echo "not changed!"
fi