Symbolic links on the command line are followed, symbolic links in file hierarchies are not followed.
-L
Symbolic links on the command line and in file hierarchies are followed.
-I mask
Ignore files and directories matching the specified mask.
-P
No symbolic links are followed. This is the default.
-a
Display an entry for each file in a file hierarchy.
-h
"Human-readable" output. Use unit suffixes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and Petabyte.
-r
Generate messages about directories that cannot be read, files that cannot be opened, and so on. This is the default case. This option exists solely for conformance with -xpg4.
-s
Display an entry for each specified file. (Equivalent to -d 0)
-d depth
Display an entry for all files and directories depth directories deep.
-c
Display a grand total.
-k
Display block counts in 1024-byte (1-Kbyte) blocks.
-m
Display block counts in 1048576-byte (1-Mbyte) blocks.
-x
File system mount points are not traversed.
The du utility counts the storage used by symbolic links and not the files they reference unless the -H or -L option is specified. If either the -H or -L options are specified, storage used by any symbolic links which are followed is not counted or displayed.
Files having multiple hard links are counted (and displayed) a single time per du execution.
If the environment variable BLOCKSIZE is set, and the -k option is not specified, the block counts will be displayed in units of that size block. If BLOCKSIZE is not set, and the -k option is not specified, the block counts will be displayed in 512-byte blocks.
