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pure sh bible is a collection of shell scripting recipes written strictly in POSIX sh, without relying on Bash-only or external utilities unless absolutely necessary. The goal is to show that you can do a surprising amount with just portable, “pure” shell, which makes your scripts work across many Unix-like systems out of the box. Each snippet solves a common task (string handling, arrays, math, file operations, argument parsing) and is written in a way that favors clarity and portability...