od.1posix -vAn -N4 -tu4 %3C %2Fdev%2Furandom
dump files in various formats
-v     Write all input data. Without the -v option, any number of groups of output lines, which would  be
       identical  to the immediately preceding group of output lines (except for the byte offsets), shall
       be replaced with a line containing only an asterisk ( '*' ).
-N  count
       Format  no  more  than  count  bytes of input. By default, count shall be interpreted as a decimal
       number. With a leading 0x or 0X, count shall be interpreted as a  hexadecimal  number;  otherwise,
       with  a  leading  '0' , it shall be interpreted as an octal number. If count bytes of input (after
       successfully skipping, if -j skip is specified) are not available, it shall not be  considered  an
       error; the od utility shall format the input that is available.
source manpages: od