These lines are formatted as follows: In the following list, all quantities expressed in 512-byte units (1024-byte when -k is specified) will be rounded up to the next higher unit. The fields are: The name of the file system, in an implementation-defined format. The total size of the file system in 512-byte units. The exact meaning of this figure is implementation-defined, but should include , , plus any space reserved by the system not normally available to a user. The total amount of space allocated to existing files in the file system, in 512-byte units. The total amount of space available within the file system for the creation of new files by unprivileged users, in 512-byte units. When this figure is less than or equal to zero, it shall not be possible to create any new files on the file system without first deleting others, unless the process has appropriate privileges. The figure written may be less than zero. The percentage of the normally available space that is currently allocated to all files on the file system. This shall be calculated using the fraction: expressed as a percentage. This percentage may be greater than 100 if is less than zero. The percentage value shall be expressed as a positive integer, with any fractional result causing it to be rounded to the next highest integer. The directory below which the file system hierarchy appear Example Example outputs of the df command: $ df Filesystem 1K-blocks Used Available Use% Mounted on udev 48764976 0 48764976 0% /dev tmpfs 9757068 173100 9583968 2% /run /dev/sda2 1824504008 723009800 1008791744 42% / tmpfs 48785328 0 48785328 0% /dev/shm tmpfs 5120 0 5120 0% /run/lock tmpfs 48785328 0 48785328 0% /sys/fs/cgroup /dev/sda1 523248 3672 519576 1% /boot/efi $ df -i Filesystem Inodes IUsed IFree IUse% Mounted on udev 12191244 500 12190744 1% /dev tmpfs 12196332 702 12195630 1% /run /dev/sda2 115859456 2583820 113275636 3% / tmpfs 12196332 1 12196331 1% /dev/shm tmpfs 12196332 5 12196327 1% /run/lock tmpfs 12196332 16 12196316 1% /sys/fs/cgroup /dev/sda1 0 0 0 - /boot/efi $ df -h Filesystem Size Used Avail Use% Mounted on udev 47G 0 47G 0% /dev tmpfs 9.4G 170M 9.2G 2% /run /dev/sda2 1.7T 690G 963G 42% / tmpfs 47G 0 47G 0% /dev/shm tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs 47G 0 47G 0% /sys/fs/cgroup /dev/sda1 511M 3.6M 508M 1% /boot/efi See also List of Unix