DF command – displays disk space usage

df The full English name of the order is “Disk Free”, As the name implies, the function is used to display the available disk space on the system . The default display unit is KB, It is recommended to use “df -h” The parameter combination of , Automatically change the appropriate unit according to the disk capacity , Better for reading .

This command is commonly used to check how much space the disk occupies 、 How much space and other information is left .

Grammar format ： df [ Parameters ] [ Specified file ]

Common parameters ：

-a	Show all system files
-B < Block size >	Specifies the block size for display
-h	Show... In an easy to read manner
-H	With 1000 Bytes are converted to display
-i	Display index byte information
-k	Specify the block size as 1KB
-l	Show only local file systems
-t < File system type >	Only the file system of the specified type is displayed
-T	Displays the file system type when outputting
-- -sync	Before getting disk usage information , Execute first sync command

Reference examples

Display disk partition usage ：

[[email protected] ~]# df
 file system                              1K- block      Already used       You can use     Already used %  Mount point 
devtmpfs                           1980612       0  1980612    0% /dev
tmpfs                              1994756       0  1994756    0% /dev/shm
tmpfs                              1994756    1040  1993716    1% /run
tmpfs                              1994756       0  1994756    0% /sys/fs/cgroup
/dev/mapper/fedora_linuxhell-root 15718400 2040836 13677564   13% /
tmpfs                              1994756       4  1994752    1% /tmp
/dev/sda1                           999320  128264   802244   14% /boot
tmpfs                               398948       0   398948   0% /run/user/0

Display partition usage in an easy to read way ：

[[email protected] ~]# df -h
  file system                             Capacity     Already used     You can use    Already used %  Mount point 
 devtmpfs                           1.9G     0  1.9G    0% /dev
 tmpfs                              2.0G     0  2.0G    0% /dev/shm
 tmpfs                              2.0G  1.1M  2.0G    1% /run
 tmpfs                              2.0G     0  2.0G    0% /sys/fs/cgroup
 /dev/mapper/fedora_linuxhell-root   15G  2.0G   14G   13% /
 tmpfs                              2.0G  4.0K  2.0G    1% /tmp
 /dev/sda1                          976M  126M  784M   14% /boot
 tmpfs                              390M     0  390M    0% /run/user/0

Display the disk usage of the partition where the specified file is located ：

[[email protected] ~]# df /etc/dhcp
 file system                              1K- block      Already used       You can use     Already used %  Mount point 
/dev/mapper/fedora_linuxcool-root 15718400 2040836 13677564   13% /

The display file type is ext4 Disk usage for ：

[[email protected] ~]# df -t ext4
 file system         1K- block     Already used     You can use      Already used %  Mount point 
/dev/sda1      999320 128264 802244   14% /boot