Create script SSH for check size folder

Hi,

i need to crate ssh script for monitoring a folder's space in CentOS. I created the script for check the space but i don't succeed to return the correct value to PRTG. In the sensor i return the code "Response not wellformed: "Spazio occupato 1326861750 byte Spazio disco ok " (code: PE132)"

I attach the script below.

CARTELLA_CLIENTE=/usr/backup/backup_neterprise/
SPAZIO_OCCUPATO=$(du -sb ${CARTELLA_CLIENTE} | cut -f1)

echo Spazio occupato ${SPAZIO_OCCUPATO} byte

check_service(){
        if [ "$SPAZIO_OCCUPATO" -ge 2000000000 ]
        then
                echo 1:404:Spazio disco massimo superato.
        fi

        if [ "$SPAZIO_OCCUPATO" -lt 2000000000 ]
        then
                echo 0:200:Spazio disco ok.
        fi
}

main() {
        check_service
}

main

Can you help me? Regards

Davide Martinello

prtg script ssh