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‘nixos-rebuild’ now accepts an argument ‘--profile-name’ (or ‘-p’), denoting the name of a system profile to use. The default is ‘system’, which maps to /nix/var/nix/profiles/system. Any other value maps to /nix/var/nix/profiles/system-profiles/<name>. The GRUB menu generator makes all system profiles available as submenus. For instance, doing $ nixos-rebuild boot -p test will cause a menu named ‘NixOS - Profile 'test'’ to be added to the GRUB boot menu, leaving the default system profile unaffected. This is only supported for GRUB 2.
*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.