Linux Command details df check disk space usage of the file system

Linux Command details df check disk space usage of the file system

Command: df

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

Syntax: # df [OPTION] [FILE]
FILE is an optional list of one or more path names. If this option is selected, the disk usage of the FILE system where the FILE is located is displayed.

Ps:
1: All Users have the permission to use the df command.
2: disk space is displayed in 1KB by default.
3: by default, the available space of all mounted file systems is displayed.
4: When a super permission user uses the df command, the capacity of a partition will exceed 100%. The reason is as follows:
Linux saves 10% of the space for Super Users. In this way, when the disk capacity is close to 100%, the system administrator can still work normally.


Parameters:

-A: displays the disk usage of all file systems (including 0 block file systems, such as/proc file systems)-B: used to specify the actual unit of the report (the default block size is 1 KB)-h: displays the file system size in a suitable unit (KB, MB, GB) for ease of reading-H: like "-h", the size of the file system is displayed in a proper unit (KB, MB, GB), but 1000 is used for capacity conversion-I: displays inode index node usage, instead of disk block-k: the disk space usage (default unit) is displayed in KB (1024 bytes).-l: only display the disk space usage of the local file system-m: In MB-P: Use POSIX output format-t: display disk space usage of a specified type of file system-T: display file system type (such as ext4)-x: displays the disk space usage of a file system that is not of the specified type (opposite to the t option)

-- Help: Display help information -- total: display total -- sync: run the sync command -- no-sync: Ignore the sync command -- version: display version information before obtaining disk information.

Ps:
1. The default value is k.
2. Without any parameters, the user will obtain free space for each mounted device on the local system.


Df command display details
# 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. It can also be understood as the path name of the device file corresponding to the file system.
1K-blocks: number of data blocks (1024 bytes) contained in the specified file system
Used: number of Used data blocks
Available: number of Available data blocks
Use %: Percentage of space used
Mounted on: mount point of the specified file system

Ps: When a common user uses this command, Used + Available <1K-blocks, because by default, each partition leaves a small amount of space for the system administrator to use.


Instance:
1. Display disk usage in a more readable 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 system partitions
# Df-

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 there is still space in the file system, but there is not enough inode 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    38  51162    1% /boot/dev/sda5      594512    11 594501    1% /doiido

4. Display disk usage in k
# 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 disks of the specified type
# 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 MB
# 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

The use of # df-m is the same, but the number is not followed by a unit, the display is 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    27       158  15% /boot/dev/sda5           9133   149      8520   2% /doiido

8. display the total usage
# 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. Get the usage of the file system through the file
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

If df is used for a directory or file in the same file system, the disk usage of the file system is entered.