FHEM: Cleans up SONOS Speak cache files. Files which have not been accessed(=played) during the last 75 days will be deleted

cleanupSonosSpeak.sh

#!/bin/bash

FILES=`ls /mnt/SonosSpeak/RINCON*`
CURRENTTIME=`date +"%s"`
PASTDAYS=75

THESHOLDATIME=`expr $CURRENTTIME - $PASTDAYS \* 24 \* 60 \* 60`

echo -e "Cleaning up all files older than $PASTDAYS days ...\n\n"

for f in $FILES
do

FILEATIME=`stat -c "%X" $f`

if [[ "$FILEATIME" < "$THESHOLDATIME" ]]; then
        echo "cleaned up $f: last access on `stat -c "%x" $f`"
        rm $f
fi

done

This one-liner does pretty much the same (less flexible though):
find /mnt/SonosSpeak -name "RINCON*" ! -atime -75d -exec rm -v {} ;