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Defensive Shell Scripting with Shell Options

emmer.dev · published 25 November 2025

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https://emmer.dev/what-is-a-script-shebang

emmer.dev

https://pubs.opengroup.org/onlinepubs/9799919799/utilities/V3_chap02.html

pubs.opengroup.org

https://www.gnu.org/software/bash/manual/html_node/The-Set-Builtin.html

gnu.org

https://zsh.sourceforge.io/Doc/Release/Options.html?utm_source=chatgpt.com

zsh.sourceforge.io

https://manpages.debian.org/unstable/dash/dash.1.en.html

manpages.debian.org

https://www.gnu.org/software/bash/manual/html_node/Shell-Parameter-Expansion.html

gnu.org

https://emmer.dev/bash-environment-variable-defaults

emmer.dev

https://blog.cloudflare.com/pipefail-how-a-missing-shell-option-slowed-cloudflare-down/

blog.cloudflare.com

https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax

docs.github.com

https://tldp.org/LDP/abs/html/subshells.html

tldp.org

https://www.gnu.org/software/bash/manual/html_node/The-Shopt-Builtin.html

gnu.org

https://www.gnu.org/software/bash/manual/html_node/Command-Execution-Environment.html

gnu.org

https://www.mulle-kybernetik.com/modern-bash-scripting/state-euxo-pipefail.html

mulle-kybernetik.com

https://mywiki.wooledge.org/BashFAQ/105

mywiki.wooledge.org

https://fvue.nl/wiki/Bash:_Error_handling

fvue.nl

When Bash Scripts Bite Read at the source ↗

blog.janestreet.com

https://mywiki.wooledge.org/BashFAQ/112

mywiki.wooledge.org

https://gist.github.com/dimo414/2fb052d230654cc0c25e9e41a9651ebe

gist.github.com

New helper added: ShellCheck – Finds bugs in your shell scripts.

shellcheck.net

https://bbs.archlinux.org/viewtopic.php?pid=1811150

bbs.archlinux.org

https://news.ycombinator.com/item?id=14322581

news.ycombinator.com