listDirectorySize

#!/bin/sh

#NF is a predefined value meaning number of fields - by putting a $ in front of it you tell the print to print the last field. $1 would be the first (null as there is nothing in front of the first separator), $2 the second (usr), $3 the third (local), $4 the fourth (bin) and $5 the fifth (firefox). In this case NF = 5 so $NF is the same as $5.

currentPath=$(pwd)
for i in $(ls -l | awk '/^d/ { print $NF }') ; do
	#echo $i
	cd $i
	echo $i'\t'$(du -ch | grep total)
	cd $currentPath
done