Re:14 Character Random Number Generator in C
by eutectic on Wednesday February 08, 2017 @12:37PM
(#13600216)
Dieharder works OK, and you can easily install it on Ubuntu as a command-line tool. PractRand and TestU01 are more stringent and give you more knobs to play with.
https://www.phy.duke.edu/~rgb/General/dieharder.php