Redirection Operators
  * >    Creates a new file containing standard output. If specified file exists, it's overwritten. No File descriptor needed.
  * >>   Appends standard output to existing file. If specified file doesn't exist, it's created. No descriptor necessary.
  * 2>   Creates a new file containing standard error. If the specified file exists it's overwritten. File descriptor necessary.
  * 2>>  Appends standard error to existing file. Creates if doesn't exist. File descriptor necessary.
  * &>   Creates a new file containing both standard output and standard error. If file exists, it's overwritten. No file descriptor necessary.
  * < Sends contents of specified file to be used as STDIN. No file descriptor necessary.
  * << Accepts text on the following lines as STDIN. No file descriptor necessary.
  * <> Causes specified file to be used for both STDIN and STDOUT. No file descriptor necessary.