2022-01-16 18:20:39 +00:00
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---
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title: "shell"
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tags: [ "Documentation", "basics" ]
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---
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2020-01-02 00:04:35 +00:00
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# Shells
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Dash - fast but limited funcionality, great for scripts.
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sh - primitive and ubiquitous.
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bash - the standard
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elvish - user-friendly, but new, with a full file-browser embedded into the system.
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# Login
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All shells launch either as login or non-login. All remote sessions without a GUI withl require authentication, and therefore will be login.
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## Login
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These shells start by reading /etc/profile then the first of ~/.bash_profile, ~/.bash_login or ~/.profile, and load all given values.
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## Non-Login
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Non-login shells will read /etc/bash.bashrc and then the ~/.bashrc file. You can summon the different shell perameters with the command `.`.
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For example, so summon the file ~/.bashrc, you can perform:
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`. ~/.bashrc`
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How the logout is handled depends upon ~/.bash_logout
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# Defaults
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The default shell config files to create for a new user are under /etc/skel.
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# Shellcheck
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Run `shellcheck script.sh` on your scripts to check them for mistakes.
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