Command to know the disk space of current directory and all subdirectory in kilo bytes
$ du -s
Summarizes the total size of directory
$ du -c
Prints the grand total of directories, recursively
$ du -a
Prints the size of every file and folder in the directory and subdirectory
$ du -h
Prints the size of directory in Human readable format, like 12M, 1.2G$ du -h -c
Prints the grand total in human readable format
$ du / -c | sort -nr | head -n 10
Command to find top 10 directory having maximum disk space
$ du / -a | sort -nr | head -n 10
Command to find top 10 file and folders having maximum size
$ df -lk
Command to know the overall disk space usage of entire HDD
