#!/bin/bash

# backup script that stops if insufficient disk space is available

if [ -z $1 ]
then
	echo enter the name of a directory to back up
	read dir
else
	dir=$1
fi

[ -d ${dir}.backup ] || mkdir ${dir}.backup

for file in $dir/*
do
	used=$( df $dir | tail -1 | awk '{ print $5 }' | sed 's/%//' )
	if [ $used -lt 98 ]
	then
		echo stopping: low disk space
		break
	fi

	cp $file ${dir}.backup
done