1. Concept
The du command is used to display the size of a directory or file.
2. Grammar
du parameter file/directory
1. Parameter description
-a or -all: Display the size of individual files in the directory.
-b or -bytes: When displaying the directory or file size, use bytes as the unit.
-c or --total: In addition to displaying the size of individual directories or files, it also displays the sum of all directories or files.
-D or --dereference-args: Display the source file size of the specified symbolic link.
-h or --human-readable: Take K, M, G as the unit to improve the readability of information.
-H or --si is the same as -h parameter, but K, M, G are conversion units of 1000.
-k or --kilobytes: Use 1024 bytes as the unit.
-l or --count-links: repeatedly count the files connected by the hardware.
-L<symbolic link> or --dereference<symbolic link>: Display the source file size of the symbolic link specified in the options.
-m or --megabytes: in units of 1MB.
-s or --summarize: display only the total.
-S or --separate-dirs: When displaying the size of individual directories, the size of its subdirectories is not included.
-x or --one-file-xystem: Take the file system at the beginning of the process as the standard, and skip it if it encounters a different file system directory.
-X<file> or --exclude-from=<file> "Specify a directory or file in <file>.
--exclude=<directory or file>: Skip the specified directory or file.
--max-depth=<number of directory levels>: After the directory exceeds the specified number of levels, it will be ignored.
--help: Show help.
--version: Display version information.
Three, example
1. Display the space occupied by a directory or file: du
2. Display the size of the specified directory or file: du apollo/ or du images/test/1442823267906.jpeg
3. Display the size of the current directory: du -sh
4. Display the size of all files in the current directory: du -sh *
Commonly used command: du -sh *, Scenario: Used to view the size of the disk file, and delete those files that take up a lot when the disk is full