Checks disk usage and rings bell forever if > 90%

disk_usage.sh

#!/bin/bash
# TODO: don't hard-code the disk in the grep command
raw_usage=$(df -h | grep -e "50G" | xargs | cut -d' '  -f4)
usage=${raw_usage//%}
echo $raw_usage

if [ $usage -gt 90 ]; then
        while (true); do
                tput bell
                sleep 1
        done
fi