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#!/bin/bash
#
# ref: https://stackoverflow.com/questions/19463334/how-to-get-time-since-file-was-last-modifi>
#
FILE=/var/lib/weewx/weewx.sdb
NOW="$(date +%s)"
LMD="$(stat -c %y ${FILE})"
LMDE="$(date +%s --date="$LMD")"

  diff=$(($NOW - $LMDE))
  if [ ${diff} -gt 600 ]
  then
      echo -n "ERROR"
  else
      echo -n "OK   "
  fi
  echo "   ${FILE} was last modified ${diff} seconds ago"
echo ""