I used something similar installed as an user command, but it's a trivial one-liner and only good reason to include it in distribution would be to do it right while avoiding possible mistakes and pitfalls—which the proposed code doesn't do. (Where does 4294967294 come from? Twice the MINSTD modulus? It seems to be written for different interpreter because it's a tiny fraction of the 64-bit state used by GNU APL's ⎕RL.)
However, doing it through ⎕FIO sounds like a really good idea, because it could, for example, instead of reading from /dev/urandom, expose the getentropy/getrandom syscall on systems that support it (which includes linux >3.17) with only reading from a device as a fallback on systems that don't. -k
