pure sh bible

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 over clever one-liners. It’s especially useful for people who have to write init scripts, Docker entrypoints, embedded or minimal-system scripts where Bash is not guaranteed. By centralizing idioms, the repo becomes a reference you can copy from instead of digging through StackOverflow every time. It also encourages good shell habits: quoting, avoiding useless forks, and staying POSIX.