/dev/urandom

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wikipedia:urandom


head -10 /dev/urandom | sha512sum | cut -b 1-30
head -c 16 /dev/urandom | od -An -t x | tr -d ' '


https://github.com/coreutils/coreutils/blob/master/NEWS

 shred, sort, shuf: now use an internal pseudorandom generator by default.
 This is mainly noticeable in shred where the 3 random passes it does by
 default should proceed at the speed of the disk.  Previously /dev/urandom
 was used if available, which is relatively slow on GNU/Linux systems.

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