This is an easy to understand example based tutorial aimed at those who know nothing of awk.

Comparison among the number of command line options for various commands for v7 Unix (1979), slackware 3.1 (1996), ubuntu 12 (2015), and ubuntu 17 (2017).

The number of command line options has dramatically increased over time; they tend to have more options and there are no cases where programs have fewer options.

Python codes implementing algorithms described in Bishop's book "Pattern Recognition and Machine Learning"

ffsend is a fully featured CLI client for Firefox Send. This article explains how to securely share files from commandline with ffsend on Linux.