#+title: Updating nix channels

I'm always forgetting this:

The command =nix-channel= is used to create aliases which can be referenced in =configuration.nix=
on nixos. The most important alias is =nixos=, which is used for the default =pkgs= reference in
your config. Channels are neat but I personally am not really a fan because it is state that exists
outside of your config. To change the default nix-channel reference:

#+begin_src sh
# nix-channel --list
nixos https://nixos.org/channels/nixos-19.09

# nix-channel --remove nixos
uninstalling 'nixos-19.09.1861.eb65d1dae62'
building '/nix/store/xsk9wjy0dpp7w7d3r3bkzxzaklqdzq6q-user-environment.drv'...
created 0 symlinks in user environment

# nix-channel --add 'https://nixos.org/channels/nixos-19.09' nixos

# nix-channel --list
nixos https://nixos.org/channels/nixos-19.09

# nix-channel --update
nixos https://nixos.org/channels/nixos-19.09
#+end_src

And then updating the nix-channels can be done with:

#+begin_src sh
# nix-channel --update
#+end_src