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This article ought to generate a bit of well-deserved flak concerning `bc`

Edit: And `uname` geeez. All-in-all, not a great article.

I never expected to find bc on such a list.

It's actually a simple programming language with user defined functions, conditionals, loops, etc.

Also, dc was the math engine for the old RSA in five lines of perl. http://www.cypherspace.org/rsa/pureperl.html Clearly a powerful tool.