16.4.5. Using the df Command
The df command allows you to display a detailed report on the system's disk space usage. To do so, type the following at a shell prompt:
df
For each listed file system, the df command displays its name (Filesystem), size (1K-blocks or Size), how much space is used (Used), how much space is still available (Available), the percentage of space usage (Use%), and where is the file system mounted (Mounted on). For example:
~]$ df
Filesystem 1K-blocks Used Available Use% Mounted on
rootfs 18877356 4605476 14082844 25% /
devtmpfs 370080 0 370080 0% /dev
tmpfs 380976 256 380720 1% /dev/shm
tmpfs 380976 3048 377928 1% /run
/dev/mapper/vg_fedora-lv_root 18877356 4605476 14082844 25% /
tmpfs 380976 0 380976 0% /sys/fs/cgroup
tmpfs 380976 0 380976 0% /media
/dev/vda1 508745 85018 398127 18% /boot
By default, the df command 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, supply the -h command line option, which causes df to display the values in a human-readable format:
df -h
For instance:
~]$ df -h
Filesystem Size Used Avail Use% Mounted on
rootfs 19G 4.4G 14G 25% /
devtmpfs 362M 0 362M 0% /dev
tmpfs 373M 256K 372M 1% /dev/shm
tmpfs 373M 3.0M 370M 1% /run
/dev/mapper/vg_fedora-lv_root 19G 4.4G 14G 25% /
tmpfs 373M 0 373M 0% /sys/fs/cgroup
tmpfs 373M 0 373M 0% /media
/dev/vda1 497M 84M 389M 18% /boot
Note that the /dev/shm entry represents the system's virtual memory file system, /sys/fs/cgroup is a cgroup file system, and /run contains information about the running system.
For a complete list of available command line options, refer to the df(1) manual page.
