df displays the amount of disk space available on the file system containing each file name argument.


If no file name is given, the space available on all currently mounted file systems is shown. Disk space is shown in 1 K blocks by default, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used.

Display values are in units of the first available SIZE from --block-size, and the DF_BLOCK_SIZE, BLOCK_SIZE and BLOCKSIZE environment variables. Otherwise, units default to 1024 bytes (or 512 if POSIXLY_CORRECT is set).

SIZE is an integer and optional unit (example: 10M is 10*1024*1024). Units are K, M, G, T, P, E, Z, Y (powers of 1024) or KB, MB, … (powers of 1000).

If an argument is the absolute file name of a disk device node containing a mounted file system, df shows the space available on that file system rather than on the file system containing the device node (which is always the root file system). df cannot show the space available on unmounted file systems, because on most kinds of systems doing so requires very system-specific knowledge of file system structures.

Useful Options / Example

df -h

Display all file systems and their disk usage but uses human readable formatting.

$ df -h
Filesystem               Size  Used Avail Use% Mounted on
/dev/mapper/vg1-lv_root  244G   12G  220G   6% /
devtmpfs                 7.8G     0  7.8G   0% /dev
tmpfs                    7.8G  102M  7.7G   2% /dev/shm
tmpfs                    7.8G  8.7M  7.8G   1% /run
tmpfs                    7.8G     0  7.8G   0% /sys/fs/cgroup
tmpfs                    300M  6.0M  295M   2% /var/lib/sss/db
/dev/sda4                485M  155M  305M  34% /boot
/dev/sda1                496M   36M  461M   8% /boot/efi
/dev/mapper/vg1-lv_tmp    30G   45M   28G   1% /tmp
AFS                      2.0T     0  2.0T   0% /afs
tmpfs                    1.6G   32K  1.6G   1% /run/user/99515263

Example command


Display the amount of free space in the public_html directory

$ df example_folder
Filesystem      1K-blocks  Used  Available Use% Mounted on
AFS            2147483647     0 2147483647   0% /home/divshar


Command Description
-a, –all Include dummy file systems.
-B, –block-size=SIZE Scale sizes by SIZE before printing them. E.g., ‘-BM’ prints sizes in units of 1,048,576 bytes. See “SIZE Format” below for more information.
–total Display a grand total.
-h, –human-readable Print sizes in human readable format (e.g., 1K 234M 2G).
-H, –si Same as -h, but use powers of 1000 instead of 1024.
-i, –inodes List inode information instead of block usage.
-k Like –block-size=1K.
-l, –local Limit listing to local file systems.
–no-sync Do not invoke a sync before getting usage info, which is the default setting.
-P, –portability Use the POSIX output format.
–sync Invoke a sync before getting usage info.
-t, –type=TYPE Limit listing to file systems of type TYPE.
-T, –print-type Print file system type.
-x, –exclude-type=TYPE Limit listing to file systems not of type TYPE.
-v Ignored; included for compatibility reasons.
–help Display a help message and exit.
–version Output version information and exit.