List the 10 largest files in the working directory:
ls -lS | head -10
List the 10 largest files and print size in KB:
ls -lS | head -10 | awk '{print $5/1024 "KB", $9}'
List files larger than 50 MB :
find . -type f -size +50000k -exec ls -lh {} \; | awk '{print $9 " : " $5}'
Find out the largest Directory :
du -h | grep [0-9]G | sort -n -r | head -5
The above command will list the top 5 directories that occupy the most space in GB (if you want MB, replace [0-9]G with [0-9]M).