Disk Space shell script

Displays the total available disk space and space used. 
#!/usr/bin/bash

# Displays disk space [total available space, space used]
# Arul John

total=0
for i in `df -k | tail +2 | awk '{print $2}'`
  do
  total=`expr $total + $i`
done
echo "$total"

total=0
for i in `df -k | tail +2 | awk '{print $3}'`
  do
  total=`expr $total + $i`
done
echo "$total"
Last Updated: 30 September 2008