A quick way to get the summary of available and used disk space on your Linux system is to type in the ‘df’ command in a terminal window.
The command df stands for “disk filesystem“.
With the -h option (df -h) it shows the disk space in “human readable” form, which means, it gives you the units along with the numbers.
$ df -h Filesystem Size Used Avail Use% Mounted on /dev/sda9 38G 10G 26G 29% / none 4.0K 0 4.0K 0% /sys/fs/cgroup udev 483M 4.0K 483M 1% /dev tmpfs 99M 1.5M 97M 2% /run none 5.0M 0 5.0M 0% /run/lock none 493M 92M 401M 19% /run/shm none 100M 52K 100M 1% /run/user /dev/sda5 41G 32G 8.5G 79% /media/vineesh/E
The output of the df command is a table with six columns. The first column contains the file system path, which can be a reference to a hard disk or another storage device, or a file system connected through the network. The second column shows the capacity of that file system. The third column shows the current space usage, the third column shows available space, fifth column shows the usage in percentage and the sixth and last column shows the path on which that file system is mounted. The mount point is the place in the directory tree where you can find and access the that file system.
The ‘du’ command on the other hand shows the disk space used by the files and directories in the current directory. Again the -h option (df -h) makes the output easier to comprehend.