Monitor files for recent timestamps

check_recent_ts.sh

#!/bin/bash

WARN="180"
CRITICAL="300"
USE_MODIFY_TIME=false # default to use the contents of the file

while [ "$1" != "" ]; do
    param=${1%%=*}
    value=${1#*=}
    case $param in
        --warn)
            WARN=$value
            ;;
        --critical)
            CRITICAL=$value
            ;;
        --use-modify-time)
            USE_MODIFY_TIME=true
            ;;
        --file)
            FILE=$value
            ;;
        --find-dir)
            FIND_DIR=$value
            ;;
        --find-name)
            FIND_NAME=$value
            ;;
    esac
    shift
done

[ -z "$FILE" ] && [ -z "$FIND_DIR" ] && echo "missing --file or --find-name && --find-dir" && exit 3;
[ -n "$FIND_DIR" ] && [ -z "$FIND_NAME" ] && echo "missing --find-name" && exit 3

NOW=`date -u +%s`
WARN_MIN=$(($NOW - $WARN))
CRITICAL_MIN=$(($NOW - $CRITICAL))

if [ -n "$FILE" ]; then

    [ ! -f "$FILE" ] && echo "file $FILE does not exist" && exit 3

    if [ $USE_MODIFY_TIME ]; then
        DT=`stat --format=%Y "$FILE"`
    else
        DT=`cat "$FILE"`
    fi
    DIFF=$(($NOW - $DT))

    echo "$FILE is $DIFF seconds old (warn at $WARN critical at $CRITICAL)"
    if [ $DT -lt $CRITICAL_MIN ]; then
        exit 2;
    fi
    if [ $DT -lt $WARN_MIN ]; then
        exit 1;
    fi
    exit 0;
else
    status=""
    files_found=0
    warning_exit="false"
    critical_exit="false"
    for filename in `find -L $FIND_DIR -name "$FIND_NAME" -print -type f`; do
        if [ $USE_MODIFY_TIME ]; then
            DT=`stat --format=%Y "$filename"`
        else
            DT=`cat "$filename"`
        fi
        DIFF=$(($NOW - $DT))
        files_found=$(( $files_found + 1 ))
        if [ $DT -lt $CRITICAL_MIN ]; then
            status="$status $filename (${DIFF}s old)"
            critical_exit="true"
        elif [ $DT -lt $WARN_MIN ]; then
            status="$status $filename (${DIFF}s old)"
            warning_exit="true"
        fi
    done
    
    if [ -n "$status" ]; then
        echo $status
    else
        echo "$files_found files OK"
    fi
    [ $critical_exit == "true" ] && exit 2
    [ $warning_exit == "true" ] && exit 1
    exit 0;
    
fi