Check Disk Space through SHELL script (cronjob) and send an HTTP request when it reaches the limit

check-disk-space.sh

#!/bin/bash
# Check Disk Space and send an HTTP request when it reaches the limit

# Once used space is higher than this limit, the webhook will be triggered (in percentage)
LIMIT='80'

# Stores the percentage of used space
USED=`df . | awk '{print $5}' | sed -ne 2p | cut -d"%" -f1`

# Webhook URL
RVMHTTP='https://example.com/webhook.php'

if [ $USED -gt $LIMIT ]
then
        curl -X GET -G ${RVMHTTP} \
          -d "usage=${USED}"
fi

# Outputs the used space %
echo $USED

exit 1