$ dd if=/dev/urandom bs=512 count=1 2>/dev/null | base64 -w 0 | ent
Entropy = 5.933850 bits per byte.
Optimum compression would reduce the size
of this 684 byte file by 25 percent.
Chi square distribution for 684 samples is 2310.15, and randomly
would exceed this value 0.01 percent of the times.
Arithmetic mean value of data bytes is 85.0731 (127.5 = random).
Monte Carlo value for Pi is 4.000000000 (error 27.32 percent).
Serial correlation coefficient is -0.018269 (totally uncorrelated = 0.0).