Dev-random
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Due to technical limitations, this article uses an unusual title. It should be called /dev/random.
In Unix and Unix-like operating systems, /dev/random is a special file, which serves as a generator of random numbers. This can be either a truly random number, generated from a source of entropy such as device drivers, or a pseudorandom number generator, in which the numbers are not truly random, but based on an algorithm which creates a diverse range of numbers.