od

See aA\n in ascii, decimal and hexadecimal

$ echo aA | od -t auCx1
0000000   a   A  nl
         97  65  10
         61  41  0a
0000003

  • a outputs the named chars, like '\n' for newline.

  • uC outputs the decimal equivalent, for example, 'a' is 97.

  • x1 outputs hex in two byte portions