nixos-rebuild

Reconfigure a NixOS machine. More information: 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