tldr/pages/linux/nixos-rebuild.md

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# nixos-rebuild
> Reconfigure a NixOS machine.
> Documentation: <https://nixos.org/nixos/manual/#sec-changing-config>.
- Build and switch to the new configuration, making it the boot default:
`sudo nixos-rebuild switch`
- Build and switch to the new configuration, making it the boot default and naming the boot entry:
`sudo nixos-rebuild switch -p {{name}}`
- Build and switch to the new configuration, making it the boot default and installing updates:
`sudo nixos-rebuild switch --upgrade`
- Rollback changes to the configuration, switching to the previous generation:
`sudo nixos-rebuild switch --rollback`
- Build the new configuration and make it the boot default without switching to it:
`sudo nixos-rebuild boot`
- Build and activate the new configuration, but don't make a boot entry (for testing purposes):
`sudo nixos-rebuild test`
- Build the configuration and open it in a virtual machine:
`sudo nixos-rebuild build-vm`