Nix 2.29.1
Nix, the purely functional package manager; unstable internal interfaces
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R""(
Upgrade Nix to the stable version declared in Nixpkgs:
Upgrade Nix in a specific profile:
This command upgrades Nix to the stable version.
By default, the latest stable version is defined by Nixpkgs, in nix-fallback-paths.nix and updated manually. It may not always be the latest tagged release.
By default, it locates the directory containing the nix binary in the $PATH environment variable. If that directory is a Nix profile, it will upgrade the nix package in that profile to the latest stable binary release.
You cannot use this command to upgrade Nix in the system profile of a NixOS system (that is, if nix is found in /run/current-system).
)""