NixOS

• Profile (default, user profile)
• root -> default profile /nix/var/nix/profiles/default
  • Each Profile has a Generation (change each time the environment change with nix-env)
    • list
    • delete
    • switch
    • stored in the nix-store in xxx-user-env package

	Build the configuration	Make the default boot	Switch the running system to it	Comments
nixos-rebuild switch	Yes	Yes	Yes
nixos-rebuild test	Yes	No	Yes
nixos-rebuild boot	Yes	Yes	No (next reboot)
nixos-rebuild switch -p test	Yes	?	?	Show up in a different Grub sub-menu
nixos-rebuild build	Yes	No	No
nixos-rebuild build-vm	Yes	No	No	Generate a Qemu image

Command		Comment
nixos-rebuild switch --upgrade	Update	nix-channel --update nixos; nixos-rebuild-switch

nix-channel --list
nix-channel --add <URL> <NAME>
nix-channel --remove <NAME>
nix-channel --update <NAME>

nix-env -q	list installed derivations
nix-env -qa	view the set of available packages in Nixpkgs
nix-env -qaf <path/to/nixpkg>	view the set of available packages from a specific Nixpkgs folder
nix-env -qas	get the status of the available package
nix-env -i <package>	install the given package
nix-env -e <package>	uninstall the given package
nix-env -u <package>	upgrade the given package
nix-env -u	upgrade all the package
nix-env -u --dry-run
nix-env --delete-generation old	delete older generations
nix-env --delete-generation 10 11 12	delete generations 10 11 12
nix-env --delete-generation 10d	delete generations older than 10d
nix-env -G 3	switch to the generation 3
nix-store --gc
nix-store --gc --print-dead
nix-store --gc --print-live
nix-collect-garbage -d
nix-env --list-generations
nix-env --switch-profile /nix/var/nix/profiles/my-profile
nix-env --rollback	To switch to the previous generation