$swrng -dd -fn STDOUT -nb 1200000000 | ent
Entropy = 8.000000 bits per byte.

Optimum compression would reduce the size
of this 1200000000 byte file by 0 percent.

Chi square distribution for 1200000000 samples is 243.72, and randomly
would exceed this value 68.35 percent of the times.

Arithmetic mean value of data bytes is 127.5010 (127.5 = random).
Monte Carlo value for Pi is 3.141621280 (error 0.00 percent).
Serial correlation coefficient is -0.000054 (totally uncorrelated = 0.0).