#!/bin/bash

# Feb 2021
# extracted from SNA/BACKUP lecture

tmp=`df -P | sed 1d | grep -vE '^udev|tmpfs|^cgroup|^rpool/ROOT/'`

echo "$tmp" | while read line; do
	percent=`echo $line | awk '{print $5}' | sed 's/%//'`
	(( percent > 89 )) && echo $line
	unset percent
done; unset line