-a      Display an entry for each file in a file hierarchy.

-c      Display a grand total.

-d depth
             Display an entry for all files and directories depth directories deep.

-H      Symbolic links on the command line are followed, symbolic links in file hierarchies are not followed.

-h      "Human-readable" output.  Use unit suffixes: Byte, Kilobyte, Megabyte, Gigabyte, Terabyte and Petabyte.

-I mask
             Ignore files and directories matching the specified mask.

-g      Display block counts in 1073741824-byte (1-Gbyte) blocks.

-k      Display block counts in 1024-byte (1-Kbyte) blocks.

-L      Symbolic links on the command line and in file hierarchies are followed.

-m      Display block counts in 1048576-byte (1-Mbyte) blocks.
-P      No symbolic links are followed.  This is the default.

-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 X/Open Portability Guide Issue 4 (``XPG4'').

-s      Display an entry for each specified file.  (Equivalent to -d 0)

-x      File system mount points are not traversed.
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