lk/fundamentals/shell.md

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