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<h1> NixOS Quick Tips </h1>
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<date> 2020-10-19 19:05</date>
<p>install a package:
<code>nix-env -i hello</code> &lt;-- not reproducible and hence not advisable
or<br>
edit <code>/etc/nixos/configuration.nix</code> to ensure system wide install
<code>nixos-rebuild switch</code> &lt;-- create new generation
<code>nixos-rebuild test</code> &lt;-- only active while computer on</p>
<p><code>sudo nixos-rebuild test -I nixpkgs=~/usr/nixpkgs/</code>
^-- use local repo to build pkgs</p>
<p>find out where in the store a binary is:
<code>readlink -f $(which hello)</code></p>
<p>search packages
<code>nix-env -qaP '.*hello.*'</code>
or
<code>nix search &lt;pkg&gt;</code></p>
<p>search nix package options
<code>nixos-option &lt;option&gt;</code></p>
<p>clear up space:
<code>nix-collect-garbage -d</code></p>
<p>upgrade to new channel:
<code>nix-channel --list</code> # show what version we're on
<code>nix-channel --add https://nixos.org/channels/nixos-XX.XX nixos</code>
<code>nix-channel --update</code>
<code>nixos-rebuild switch</code>
remember to use <code>sudo</code> if you want to update the system</p>
<p>use a package through nix-shell:
<code>nix-shell -p &lt;package&gt;</code></p>
<p>list generations
<code>nix-env --list-generations</code></p>
<p>list installed packages
<code>nixos-option environment.systemPackages</code>
or
<code>nix-env --query</code></p>
<p>install a nixOS .nix file through nix package manager
<code>nix-env -f nvim.nix -i neovim</code></p>
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