Display disk space, available and space used

This 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"

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