Follow-up Comment #3, patch #6797 (project coreutils):
The random data does not have to reside on disk. You can use a named fifo
and use another process to generate random data into the pipe. In other
words, if you can generate the data on the fly, you do not need pre-save it on
disk. Modern shells make this easy with process substitution:
--random-source=<(your random generator process). But even without that,
coreutils includes the mkfifo program to create your own named fifo.
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