df command (disk free) displays the amount of total and free disk space available on the mounted filesystems.
Syntax: df [options] [name]
How much GB of disk space is free on my system? Use df -h as shown below. Option -h displays the values in human readable format (for example: K for Kb, M for Mb and G for Gb). In the sample output below, / filesystem has 17GB of disk space available and /home/user filesystem has 70GB available.
# df –h Filesystem Size Used Avail Use% Mounted on /dev/sda1 64G 44G 17G 73% / /dev/sdb1 137G 67G 70G 49% /home/user
What type of filesystem do I have on my system? Option -T will display the information about the filesystem Type. In this example / and /home/user filesystems are ext2. Option -a will display all the filesystems, including the 0 size special filesystem used by the system.
# df -Tha Filesystem Type Size Used Avail Use% Mounted on /dev/sda1 ext2 64G 44G 17G 73% / /dev/sdb1 ext2 137G 67G 70G 49% /home/user none proc 0 0 0 - /proc none sysfs 0 0 0 - /sys none devpts 0 0 0 - /dev/pts none tmpfs 2.0G 0 2.0G 0% /dev/shm