Date: Tue, 19 Nov 2024 12:14:42 -0300
From: Silas <silas_alp24@silas.net.br>
To: ~alpine/users@lists.alpinelinux.org
Subject: Re: Resources for learning shell scripting
Message-ID: <ZzyrYnOLizBAvg30@motherbrain>
References: <d1738ee7-115d-4851-8514-8b5eb3adb002@h6g.de>
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On Tue, Nov 19, 2024 at 03:57:42PM +0100, Paul Zillmann wrote:
>Could you recommend any good resources to learn how to script for 
>POSIX in the first place?
>Are there any good websites, books or even man pages available?

Hello.

Reading different Bourne shell implementations man pages can help a 
lot. I recommend NetBSD and OpenBSD sh(1) man page.

There may be some Alpine specific software written in Bourne shell 
(openrc? which is actually not Alpine specific...), but I not too 
familiar with Alpine to recommend any.

Reading good implementations of programs writting in Bourne shell can 
help as well. On the top of my head, I remember acme.sh and NetBSD 
postinstall programs can be good refereces.

There may be other good resources on the web.  Some examples:

http://www.shelldorado.com/

David Wheeler's articles about shell security, like this one: 
https://dwheeler.com/essays/filenames-in-shell.html