du is a Linux command, is to display the file space allocated to each file and Directory contained in the current directory. It Summarize disk usage of each FILE, recursively for directories.
# du - List of directories that exist in the current directory along with their sizes.
# du -c -Gives grand toal as last line of output.
# du -s -Displays summary of directory size.
# du -h -Displays size in human readable format.
Sort Directory size in ascending order.
# sudo du -sh * | sort -hr