Yes, I'm aware of that. The commenter seems to be implying that one should stop using a shell script when one needs "true" random, and I'm curious as to why sin

Yes, I'm aware of that. The commenter seems to be implying that one should stop using a shell script when one needs "true" random, and I'm curious as to why since one can call out to Perl, Python, etc. The linked gist doesn't appear to be making the case for using its recommendations in cryptographic applications so what I'm ultimately after is what the commenter thinks is being done in the shell that's inappropriate.