42 codes

Portability and Robustness issues commonly found in shell scripts

match command-line arguments to their help text

If two statisticians were to lose each other in an infinite forest, the first thing they would do is get drunk. That way, they would…

I am big fan of shell scripts and so love to learn interesting stuff from other's shell scripts. Recently i came across the authy-ssh scripts which eases two-factor authentication for ssh servers. When i walk through scripts, i learned lot of cool things that i am going to share it with you.

This is mathematical section of the parent essay Gödel Incompleteness for Startups Gödel Numbering A formal system is just a collection of axioms and rules.

Can you always turn a recursive function into an iterative one? Yes, absolutely, and the Church-Turing thesis proves it if memory serves. In lay terms, it states that what is computable by recursive functions is computable by an iterative model (such as the Turing machine) and vice versa. The thesis does not tell you precisely how to do the conversion, but it does say that it's definitely possible.

The paper MegaPipe: A New Programming Interface for Scalable Network I/O ( video , slides ) h...

If God had a similar book for algorithms, what algorithm(s) do you think would be a candidate(s)?

To write clean code, you must first write dirty code and then clean it. With pleasure I have been reading Clean Code by Robert C. Martin. T…

In The Hitchhiker's Guide to the Galaxy by Douglas Adams, the number 42 is the "Answer to the Ultimate Question of Life, the Universe, and Everything". But he didn't say what the question was! Sinc...

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If you said, “Hey! That’s a TCP header diagram in Lego(TM)”, or perhaps, “Holy &^%@! That idiot made a TCP header diagram in Lego(TM)!”, then you’re exactly right!  This is another one of those wild, wacky ideas that we dreamed up in the middle of one of my SANS classes (note to the SANS staff: shorter breaks might be a good idea).  I bet my students never thought I’d actually do it.