$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 261.02, and randomly
would exceed this value 38.44 percent of the times.
Arithmetic mean value of data bytes is 127.4957 (127.5 = random).
Monte Carlo value for Pi is 3.141706920 (error 0.00 percent).
Serial correlation coefficient is 0.000007 (totally uncorrelated = 0.0).