Date: Tue, 19 Nov 2024 20:03:40 +0100
Author: Steffen Nurpmeso <steffen@sdaoden.eu>
From: Steffen Nurpmeso <steffen@sdaoden.eu>
To: Paul Zillmann <p.zillmann@h6g.de>
Cc: "~alpine/users@lists.alpinelinux.org" <~alpine/users@lists.alpinelinux.org>
Subject: Re: Resources for learning shell scripting
Message-ID: <20241119190340.nHqfWGEL@steffen%sdaoden.eu>
In-Reply-To: <d1738ee7-115d-4851-8514-8b5eb3adb002@h6g.de>
References: <d1738ee7-115d-4851-8514-8b5eb3adb002@h6g.de>
Mail-Followup-To: Paul Zillmann <p.zillmann@h6g.de>,
 "~alpine/users@lists.alpinelinux.org" <~alpine/users@lists.alpinelinux.org>
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Paul Zillmann wrote in
 <d1738ee7-115d-4851-8514-8b5eb3adb002@h6g.de>:
 |recently I have to write a bit of shell scripts and I find myself with=20
 |the problem of finding solutions online that are compatible with GNU=20
 |bash, but not with busyboxes POSIX shell.
 |So I would spend a bit of time to adapt those scripts to be able to run=
=20
 |with /bin/ash.
 |
 |Could you recommend any good resources to learn how to script for POSIX=
=20
 |in the first place?
 |Are there any good websites, books or even man pages available?
 |
 |I'm not a very good bash scripter myself, usually I work with compiled=20
 |languages like C and Golang.

Sven Mascheck is "an instance" regarding history of shell and
compatibility, used even by shell standard developers like Chet
Ramey (bash), dear J=C3=B6rg Schilling (bosh), and other shell experts
like Stephane Chazelas:

  https://www.in-ulm.de/~mascheck/

Other than that it is a good idea to write scripts in shells which
are dedicated to POSIX compatibility, like dash.

(I have no idea of those "shell-check" tools which exist, many
swear by them.)

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)
|
|And in Fall, feel "The Dropbear Bard"s ball(s).
|
|The banded bear
|without a care,
|Banged on himself fore'er and e'er
|
|Farewell, dear collar bear