Nix reference manual#
The Nix reference manual is available for multiple versions:
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Development build from the masterbranch of the Nix repository
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Latest Nix release 
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Shipped with the current stable release of Nixpkgs and NixOS: 25.05 
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Shipped with the previous stable release of Nixpkgs and NixOS: 24.11 
Tip
More information on Nixpkgs and NixOS releases: Which channel branch should I use?