Nix

Commands	Description
`nix-info -m`	Get high level info of Nix in a mardown format
`nix-env {-i \| --install} <package>`	Install package. Nix will first try to get it in pre-compiled form from a binary cache. If no binary is available, it will build the package from source.
`nix-env {-e \| --uninstall} <package>`	Uninstall package
`nix-env -u <package>`	Upgrade package to newer version
`nix-env -u`	Upgrade all packages
`nix-env -u --dry-run`	See what nix will about to upgrade, without actually upgrading it.
`nix-env -qa`	Query available packages. You may also query packages by name. Eg. `nix-env -qa ruby`
`nix-collect-garbage -d`	Deletes old packages
`nix-env --rollback`	Rollback to previous generation
`nix-env --list-generations`	List all available generations
`nix-env -G <generation number>`	Switch to specific generation. Eg. `nix-env -G 1`
`nix-env --delete-generations <generation number...>`	Delete specific generations. Eg. `nix-env --delete-generations 1 2`
`nix-channel --update`	Obtain latest Nix expressions in every subscribed channels

`nix-shell -p <package>`

Starts an iteractive shell with the specified pacakge.

Eg.,

$ nix-shell -p cowsay

$ cowsay hello world
 _____________
< hello world >
 -------------
        \   ^__^
         \  (oo)\_______
            (__)\       )\/\
                ||----w |
                ||     ||

Search for Node.js packages

To search for a node.js package, you'll have to run this command: nix-env -qaPA nixpkgs.nodePackages | grep <node package>

Eg.,

nix-env -qaPA nixpkgs.nodePackages | grep firebase-tools