Command Shell: Difference between revisions

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{{note|[[Zsh]] is used here as an example. You can use other shells, eg {{ic|fish}}.}}
{{note|[[Zsh]] is used here as an example. You can use other shells, eg {{ic|fish}}.}}
== Enable ==
== Enable ==
Always enable the shell, otherwise it wont source the necessary files.
Always enable the shell system-wide, even if it's already enabled in your <code>home.nix</code>. Otherwise it wont source the necessary files.
{{file|/etc/nixos/configuration.nix|nix|<nowiki>
{{file|/etc/nixos/configuration.nix|nix|<nowiki>
programs.zsh.enable = true;
programs.zsh.enable = true;

Revision as of 13:52, 19 June 2021

A shell is a program that translates text commands (like ls, vim, reboot etc) into instructions for your computer. The default shell on NixOS is bash, but it can be easily changed.

Note: Zsh is used here as an example. You can use other shells, eg fish.

Enable

Always enable the shell system-wide, even if it's already enabled in your home.nix. Otherwise it wont source the necessary files.

/etc/nixos/configuration.nix
programs.zsh.enable = true;

Changing default shell

Shells can be changed system-wide and per-user. To change the shell system-wide, add the following line to your config:

/etc/nixos/configuration.nix
users.defaultUserShell = pkgs.zsh;

then run nixos-rebuild switch and reboot your system.

To only change the default shell for one of the users, add

/etc/nixos/configuration.nix
users.users.yourname.shell = pkgs.zsh;

Changing /bin/sh

Warning: Please note that NixOS assumes all over the place that shell to be Bash, so override the default setting only if you know exactly what you're doing.

/bin/sh is a symlink to your default POSIX-Compliant shell. It's used when writing shell scripts, so that the script works on all machines independently of what shell the user is using. /bin/sh doesn't have to be the same as your interactive shell (e.g. the one you use in your terminal). In fact, a lot of people set their interactive shells to zsh/fish, but set /bin/sh to dash, because it's fast and scripts don't need any of those fancy zsh/fish features.

To change your default POSIX shell on NixOS, use

# Dash is just an example, you can use whatever you want
environment.binsh = "${pkgs.dash}/bin/dash";

See also