A small dec2hex, dec2bin, dec2oct and their variants cli util.
Given a string it parses it and decides the number types from and to convert the number.
This is the requested string: <NUMBER><FROM><TO>
FROM and TO can be one of the followings: 'D'ecimal, 'B'inary, 'H'exadecimal, 'O'ctal.
NUMBER is coming as a string.
Have fun!