-N: setatt
-P: AFS_READ | AFS_WRITE
-D: Set attribute(s) for all files matching a pattern.
-U: setatt attribute{+|-}... pattern
-H: Set ('+') or unset ('-') the given attributes for all audio files matching
-H: pattern. Example:
-H:
-H: setatt rock+ punk+ pop- '*foo.mp3'
-H:
-H: sets the 'rock' and the 'punk' attribute and unsets the 'pop'
-H: attribute of all files ending with 'foo.mp3'.
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