if statements

#!/bin/bash

# Print a message about disk useage.

space_free=$( df -h | awk '{ print $5 }' | sort -n | tail -n 1 | sed 's/%//' )

case $space_free in

[1-5]*)

echo Plenty of disk space available

;;

[6-7]*)

echo There could be a problem in the near future

;;

8*)

echo Maybe we should look at clearing out old files

;;

9*)

echo We could have a serious problem on our hands soon

;;

*)

echo Something is not quite right here

;;

esac