really HN? if you find yourself depending heavily on the recommendations in this article you are doing data analysis wrong. Shell foo is relevant to data analysis only as much as regex is. In the same light depending on these methods too much is digging a deep knowledge ditch that in the end is going to limit and hinder you way more than the initial ingress time required to learn more capable data analytics frameworks or at least a scripting language.

still, on international man page appreciate day this is a great reference. the only thing it is missing is gnuplot ascii graphs.