The df command reports the system's disk space usage. If you Execute the command df at a shell prompt, the output looks similar to the following:
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/mapper/volgrp1-lvroot
14127024 6868092 6541316 52% /
tmpfs 2008828 592 2008236 1% /dev/shm
/dev/sda1 495844 65047 405197 14% /boot
/dev/mapper/luks-b20f8f7a-7f0f-4497-8de4-81bfa3e541cf
122046576 12111420 103735552 11% /home
By default, this utility shows the partition size in 1 kilobyte blocks and the amount of used and available disk space in kilobytes. To view the information in megabytes and gigabytes, use the command df -h. The -h argument stands for human-readable format. The output looks similar to the following:
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/volgrp1-lvroot
14G 6.6G 6.3G 52% /
tmpfs 2.0G 592K 2.0G 1% /dev/shm
/dev/sda1 485M 64M 396M 14% /boot
/dev/mapper/luks-b20f8f7a-7f0f-4497-8de4-81bfa3e541cf
117G 12G 99G 11% /home
In the list of mounted partitions, there is an entry for /dev/shm. This entry represents the system's virtual memory file system.
The du command displays the estimated amount of space being used by files in a directory. If you execute du at a shell prompt, the disk usage for each of the subdirectories is displayed in a list. The grand total for the current directory and subdirectories are also shown as the last line in the list. If you do not want to see the totals for all the subdirectories, use the command du -hs to see only the grand total for the directory in human-readable format. Use the du --help command to see more options.
To view the system's partitions and disk space usage in a graphical format, use the Gnome System Monitor by clicking on → → or executing the gnome-system-monitor command at a shell prompt. Select the File Systems tab to view the system's partitions. The figure below illustrates the File Systems tab.
