nagios_check_files_age.sh

#!/usr/bin/env bash
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#

usage() {
echo "Usage: $0 [-c <critical seconds>] [-w <warning seconds>] [-f file pattern with path (required)] [-s strict file check]"
exit 1
}

CRIT=
WARN=
FILE_PATTERN=
STRICT_FILE_CHECK=0
# Nagios Exit Codes
OK=0
CRITICAL=2
WARNING=1
UNKNOWN=3

while getopts w:c:f:s:h option
do
  case $option
  in
    c) CRIT=$OPTARG;;
    w) WARN=$OPTARG;;
    s) STRICT_FILE_CHECK=1;;
    f) FILE_PATTERN=$OPTARG;;
    h) usage
        exit $UNKNOWN;;
  esac
done
if [[ -z "$FILE_PATTERN" ]]; then
  usage
  exit $UNKNOWN
fi

YOUNGEST_FILE_LAST_MODIFIED_SECONDS=99999999
YOUNGEST_FILE_NAME="undefined"
YOUNGEST_FILE_SIZE=99999999
FILES=$( ls $FILE_PATTERN 2>&1)
if [ $? -ne 0 ]; then
   if [ ${STRICT_FILE_CHECK} -eq 1 ]; then
     echo "CRITICAL: No file found matching pattern $FILE_PATTERN"
     exit $CRITICAL
   else
     echo "OK: No file found matching pattern $FILE_PATTERN"
     exit $OK
   fi
fi
for file in $FILES; do
   AGE=$(($(date +%s) - $(date +%s -r "$file")))
   if [ $AGE ]; then
     if [ ${AGE} -lt ${YOUNGEST_FILE_LAST_MODIFIED_SECONDS} ]; then
        YOUNGEST_FILE_LAST_MODIFIED_SECONDS=$AGE
        YOUNGEST_FILE_NAME=$file
     fi
   fi
done

YOUNGEST_FILE_SIZE=$(stat -c%s $YOUNGEST_FILE_NAME)
MESSAGE="$YOUNGEST_FILE_NAME is $YOUNGEST_FILE_LAST_MODIFIED_SECONDS seconds old and $YOUNGEST_FILE_SIZE bytes.[w=$WARN , c=$CRIT s]"

if [ -n "$CRIT" ] && [ ${YOUNGEST_FILE_LAST_MODIFIED_SECONDS} -ge ${CRIT} ]; then
   echo "FILE_AGE CRITICAL: $MESSAGE"
   exit $CRITICAL
fi

if [ -n "$WARN" ] && [ ${YOUNGEST_FILE_LAST_MODIFIED_SECONDS} -ge ${WARN} ]; then
   echo "FILE_AGE WARNING: $MESSAGE"
   exit $WARNING
fi

echo "FILE_AGE OK: $MESSAGE"
exit $OK