Let us look at the 2 fields present in the syntax of the df command:<\/p>\n
1. <options><\/h4>\n
This field takes in the options available with the df command. These options specify how df should function and print the output.<\/p>\n
2. <file><\/h4>\n
This field takes in the name of the file. If you do not specify a file name then the df command shows the space available on all currently mounted file systems.<\/p>\n
Options sussed with linux df command<\/h3>\n
We have seen that the options field specifies how \u2018df\u2019 should function and format the output. Let us look at the options available with the df command<\/p>\n
1. -a<\/h4>\n
This option includes all the dummy files also in the output which are actually having zero block sizes. You can also write this option as \u201c–all\u201d<\/p>\n
2. -B<\/h4>\n
This option scale sizes by SIZE. For example, the option \u201c-BM\u201d prints size in units of 1,048,576 bytes. You can also write this option as \u201c–block-size\u201d<\/p>\n
3. –total<\/h4>\n
This option displays the grand total for size.<\/p>\n
4. -h<\/h4>\n
This option prints the sizes in a human-readable format. You can also write this option as \u201c–human-readable\u201d<\/p>\n
5. -H<\/h4>\n
This option is the same as the option \u201c-h\u201d, but uses the power of 1000, unlike option \u201c-h\u201d which uses the power of 1024. You can also write this option as \u201c–si\u201d<\/p>\n
6. -i<\/h4>\n
This option displays the inode information instead of block usage. You can also write this option as \u201c–inode\u201d<\/p>\n
7. -l<\/h4>\n
This option displays the disk usage of only local file systems. This option can also be written as \u201c–local\u201d<\/p>\n
8. -P<\/h4>\n
This option uses the POSIX output format. You can also write this option as \u201c–portability\u201d<\/p>\n
9. -t<\/h4>\n
This option shows only the output of file systems having the type you specified. You can also write this option as \u201c–type\u201d<\/p>\n
1o. –help<\/h4>\n
This option displays the help menu as shown below.<\/p>\n
This option excludes all the file systems having the type you specified from the output. You can also write this option as \u201c–exclude-type\u201d<\/p>\n This option doe not invoke sync before getting usage info.<\/p>\n This option invokes a sync before getting usage info.<\/p>\n This option prints the file system type shown in the output. You can also write this option as \u201c–print-type\u201d<\/p>\n This option prints the information about the df you are using.<\/p>\n Now that we have laid down the ground 0 fundamentals, let us look at some beautiful practical examples of the df command in the terminal.<\/p>\n If you want to check the disk space usage of your Linux file system, simply use the df command with no options at all. The df command displays the information of device name, total blocks, total disk space, used disk space, available disk space, and mount points on a file system.<\/p>\n To print information of all the filesystems\u2019 disk usage pair the df command with the option \u201c-a\u201d or \u201c–all\u201d. This command is the same as the above command, except it shows you even the information of dummy file systems along with all the file system disk usage and their memory utilization.<\/p>\n In the above outputs, we have absolutely no idea as to what the disk space is, as it is not in megabytes, kilobytes, gigabytes and so on, which are th units humans are comfortable with. Nonetheless, you can use the option \u201c-h\u201d to print in human-readable format, where K is Kilobytes, M is megabytes and G is Giga bytes.<\/p>\n If you want to know the disk usage of a specific directory or filesystem, simply specify its name of it at the end of the command. Make sure you use the option \u201c-h\u201d so that the units are in a human-readable format.<\/p>\n If you want to display all the information of the file system in 1024 byte blocks, use the option \u2018k\u2019<\/p>\n If you want to display all of the information of the filesystems in Megabytes, pair the df command with the option \u201c-m\u201d<\/p>\n If you want to display all of the information of the filesystems in Megabytes, pair the df command with the option \u201c-h\u201d<\/p>\n If you want to display the information of a number of used inodes and their percentage for the file system, use th df command along with the option \u201c-i\u201d<\/p>\n If you notice carefully, in all the above outputs, there is no section called \u201cLinux file system type\u201d, if you want to print the type of the file system, use the option \u201cT\u201d<\/p>\n When printing the disk usage of a file system, if you want to print a certain type of filesystem, use the option \u201c-t\u201d followed by the type of the filesystem.<\/p>\n When printing the disk usage of a file system, if you want to exclude a certain type of filesystem, use the option \u201c-x\u201d followed by the type of the filesystem.<\/p>\n If you want to print the total of all the disk sizes in the column, pair the df command with the option \u201c–total\u201d.<\/p>\n Use the option \u201c–sync\u201d to perform the sync system call before reporting the disk usage of filesystem information. By default, the option \u201c–no-sync\u201d is selected as it does not perform a sync system call. However, we can force the system to sync using the \u201c–sync\u201d option.<\/p>\n![\"help](\"https:\/\/data-flair.training\/blogs\/wp-content\/uploads\/sites\/2\/2022\/06\/help-menu-of-the-df-command.webp\")
<\/a><\/p>\n11. -x<\/h4>\n
12. –nosync<\/h4>\n
13. –sync<\/h4>\n
14. -T<\/h4>\n
15. \u2013version<\/h4>\n
<\/a><\/p>\nChecking disk space usage of file system<\/h3>\n
<\/a><\/p>\nDisplaying the information of all the file system disk space usage<\/h3>\n
<\/a><\/p>\nShow the disk space in human-readable format<\/h3>\n
<\/a><\/p>\nDisplaying information of the home directory<\/h3>\n
<\/a><\/p>\nDisplaying information in bytes<\/h3>\n
<\/a><\/p>\nDisplaying information in Megabytes<\/h3>\n
<\/a><\/p>\nDisplaying information in Gigabytes<\/h3>\n
<\/a><\/p>\nDisplaying filesystem inodes<\/h3>\n
<\/a><\/p>\nDisplaying the type of the filesystem<\/h3>\n
<\/a><\/p>\nIncluding certain filesystem types<\/h3>\n
<\/a><\/p>\nExcluding certain filesystem types<\/h3>\n
<\/a><\/p>\nDisplaying the grand total size<\/h3>\n
<\/a><\/p>\nPerforming a sync system call<\/h3>\n