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The
Cliff random number generator
is a very simple random number generator that “passes the noise sphere test
for randomness by showing no structure.”
It is easily programmed, in less than 10 lines of `awk`

code:

# cliff_rand.awk --- generate Cliff random numbers BEGIN { _cliff_seed = 0.1 } function cliff_rand() { _cliff_seed = (100 * log(_cliff_seed)) % 1 if (_cliff_seed < 0) _cliff_seed = - _cliff_seed return _cliff_seed }

This algorithm requires an initial “seed” of 0.1. Each new value
uses the current seed as input for the calculation.
If the built-in `rand()`

function
(see section Numeric Functions)
isn’t random enough, you might try using this function instead.