Linux df and du

 df(disk free) command

df command is used to display information related to file systems about total space and available space

To display the total space and available space for the current directory

df

To display the total space and available space for the root directory

df /

To display the total space and available space in human-readable format (like in MB or GB)

df -h

To display the total space and available space with the File system

df -T

To display the total space of the disk

df --total

To display human-readable with size in the power of 1000

df -H

To see the help of the df command

man df

df --help

du(Disk Usage) command 

To find the disk usage of files and directories.

To display the disk usage summary of a current directory tree and each of its subdirectories.

du

To display the disk usage summary in the human-readable format of a current directory tree and each of its subdirectories.

du -h

To display the summary of a grand total disk usage size of a directory

du -sh

To display the disk usage of all the files and directories

du -a

du -ah

To display directory tree and its subtree in Kilobytes

du -k