od(1) -vAn -N4 -tu4 < /dev/urandom
dump files in octal and other formats
-v, --output-duplicates
       do not use * to mark line suppression
-A, --address-radix=RADIX
       decide how file offsets are printed
-N, --read-bytes=BYTES
       limit dump to BYTES input bytes
-t, --format=TYPE
       select output format or formats
Before a command is executed, its input and output may be redirected using a special notation interpreted
by  the  shell.   Redirection  may  also  be used to open and close files for the current shell execution
environment.  The following redirection operators may precede or appear anywhere within a simple  command
or may follow a command.  Redirections are processed in the order they appear, from left to right.

Redirecting Input
    Redirection  of  input  causes  the  file  whose name results from the expansion of word to be opened for
    reading on file descriptor n, or the standard input (file descriptor 0) if n is not specified.

    The general format for redirecting input is:

source manpages: od