I wrapped up a quick script to check whether my Avira AntiVirus definitions are current. Since it might be useful to other people I thought I’d just publish it here:

#!/bin/bash

YOUNGEST_FILE=$(ls -tr /usr/lib/AntiVir/guard/*.vdf|tail -1)

WARN=$1
CRIT=$2
WARN=$((${WARN:=3} * 86400))
CRIT=$((${CRIT:=7} * 86400))

function age() {
   local filename=$1
   local changed=`stat -c %Y "$filename"`
   local now=`date +%s`
   local elapsed

   let elapsed=now-changed
   echo $elapsed
}

FILEAGE=$(age "${YOUNGEST_FILE}")

if [ $FILEAGE -gt $CRIT ]; then
    echo "CRITICAL - Youngest file is $FILEAGE sec old"
    exit 2
elif [ $FILEAGE -gt $WARN ]; then
    echo "WARNING - Youngest file is $FILEAGE sec old"
    exit 1
else
    echo "OK - Youngest file is $FILEAGE sec old"
fi

The default (if you don’t supply any command-line parms) is to warn if the youngest of all virus definition files is older than 3 days, and a critical alert will be triggered if it is older than 7 days. If you supply only one parm it will change the number of days until a warning is triggered, and if you also supply the second parm it will also change the days for a critical alert.

I hope this is useful for someone!