Linux command Details DF Check the file system disk space usage

Instruction: DF

Check the disk space usage of the file system
You can view the total capacity, usage space, remaining space, mount location, and so on for all mounted disks

Syntax:# DF [OPTION] [FILE]
File is an optional list of one or more path names, such as selecting this option to display disk usage for the file system where the file resides

Ps:
1: All users have permission to use the DF command
2: Disk space is displayed by default in 1KB
3: Default display of available space for all currently mounted file systems
4: Super-privileged users will find that a partition will have more than 100% capacity when using the DF command for the following reasons:
The Linux system retains 10% of the space for super users. This allows the system administrator to work properly when the hard disk is close to 100% capacity


Parameters:

-A: Displays disk usage for all file systems (including 0 blocks of file systems, such as/proc file system)-B: Used to specify the unit of report utility (default block size is 1KB)-H: Displays the file system size in the appropriate units (KB, MB, GB), easy to read-H: with "- H ", displays the file system size in the appropriate units (KB, MB, GB), but with 1000 capacity conversion-I: Displays inode index node usage instead of disk block-K: chunks Show disk space usage in kilobytes (1024 bytes) (default unit)-L: Show only disk space usage on the local file system-M: Display in megabytes-P: Using the POSIX output format-t: Displays disk space usage for the specified type of file system-T: Displays the file system type (such as EXT4)-X: Displays disk space usage for file systems that are not of the specified type (as opposed to the T option)

--HELP: Display Help information--total: Show total--sync: Perform the sync command before obtaining the disk information--no-sync: Ignore sync command--version: Display version information

Ps:
1, the default isDisplay by K
2, without any parameters, the user will get the free space of each mounted device on the local system


Description of DF Command display
# DF

Filesystem     1k-blocks    used Available use% mounted on/dev/sda2        9071088 1030988   7579300  12%/TMPFS             957244       0    957244   0%/dev/shm/dev/sda1         198337   26817    161280 15%  /boot/dev/sda5        9351388  151940   8724416   2%/main

Filesystem: Specifies the name of the file system, or the path name of the device file that corresponds to the file system
1k-blocks: The number of data blocks (1024 bytes) that the specified file system contains
Used: Number of data blocks used
Available: Number of available data blocks
use%: Percentage of space usage
Mounted on: Specifies the mount point of the file system

Ps: When using this directive, used + Available < 1k-blocks, because each partition is left with a small amount of space for the system administrator to use


Instance:
1. Display disk usage in an easier-to-read manner
# df-h

Filesystem      Size  used Avail use% mounted on/dev/sda2       8.7G 1007M  7.3G  12%/tmpfs           935M     0  935M   0%/dev/shm/dev/sda1       194M   27M  158M  15%/boot/dev/sda5       9.0G  149M  8.4G   2%/doiido

2. Display all the partitions of the system
# df-a

Filesystem     1k-blocks    used Available use% mounted on/dev/sda2        9071088 1030988   7579300  12%/proc                   0       0         0    -/procsysfs                  0       0         0    -/sysdevpts                 0       0         0    -/dev/ Ptstmpfs             957244       0    957244   0%/dev/shm/dev/sda1         198337   26817    161280  15%/ Boot/dev/sda5        9351388  151940   8724416   2%/doiidonone                   0       0         0    -/proc/sys/fs /binfmt_misc

3. Display Inode Index node usage
Sometimes the file system still has space, but not enough inode, so it is not possible to add files
# df-i

Filesystem     inodes iused  IFree iuse% mounted on/dev/sda2      577088 32829 544259    6%/tmpfs          239311     1 239310    1%/dev/shm/dev/sda1       51200-51162 1%/boot/dev/sda5      594512    11 594501    1%/doiido

4. Display disk usage in K units
# df-k

Filesystem     1k-blocks    used Available use% mounted on/dev/sda2        9071088 1030992   7579296  12%/ Tmpfs             957244       0    957244   0%/dev/shm/dev/sda1         198337   26817    161280  15%/boot /dev/sda5        9351388  151940   8724416   2%/doiido

5. Display the file system type.
# df-t

Filesystem     Type  1k-blocks    used Available use% mounted on/dev/sda2      ext4    9071088 1030992   7579296  12%/tmpfs          tmpfs    957244       0    957244   0%/dev/shm/dev/sda1      ext4     198337   26817    161280  15%/boot/dev/sda5      ext4    9351388  151940   8724416   2%/doiido

6. Display the specified type of disk
# df-t Ext4

Filesystem     1k-blocks    used Available use% mounted on/dev/sda2        9071088 1030992   7579296  12%// DEV/SDA1         198337   26817    161280  15%/boot/dev/sda5        9351388  151940   8724416   2%/doiido

7. Display disk usage in megabytes
# DF-BM

Filesystem     1m-blocks  used Available use% mounted on/dev/sda2          8859M 1007M     7402M  12%               /TMPFS 935M    0M      935M   0%/dev/shm/dev/sda1           194M   27M      158M  15%/boot/dev/sda5          9133M  149M     8520M   2%/doiido

Use # df-m is the same, but the number is not added after the unit, shown as follows

Filesystem     1m-blocks  used Available use% mounted on/dev/sda2           8859  1007      7402  12%                /TMPFS 935     0       935   0%/dev/shm/dev/sda1            194       149 158  15%/boot/dev/sda5   9133      8520   2%/doiido

8, display the total amount of use
# DF--total

Filesystem     1k-blocks    used Available use% mounted on/dev/sda2        9071088 1030992   7579296  12%/ Tmpfs             957244       0    957244   0%/dev/shm/dev/sda1         198337   26817    161280  15%/boot /dev/sda5        9351388  151940   8724416   2%/doiidototal           19578057   1209749 17422236 7%

9, the use of documents to obtain file system
9.1:# Df/doiido

Filesystem     1k-blocks   used Available use% mounted on/dev/sda5        9351388 151940   8724416   2%/doiido

9.2:

# Cd/doiido

# DF Dodo

Filesystem     1k-blocks   used Available use% mounted on/dev/sda5        9351388 151940   8724416   2%/ Doiido

Here you will find that using DF for a directory or file of the same file system will enter the disk usage in the file system

Linux command Details DF Check the file system disk space usage