How do I make all filenames in a directory lowercase?

  1. for i in *; do mv $i echo $i | tr [A-Z] [a-z]; done

  2. ls | mv $i | tr [A-Z] [a-z];

  3. ls | for I in do mv $i | tr [A-Z] [a-z]; done

  4. None


Correct Option: A

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