Description of `nix nar` and Nix Archive File Format

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# Description

`nix nar` provides several subcommands for creating and inspecting
[*Nix Archives* (NARs)][Nix Archive].

# File format

For the definition of the Nix Archive file format, see
[within the protocols chapter](@docroot@/protocols/nix-archive.md)
of the manual.


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Title: Description of `nix nar` and Nix Archive File Format

Summary

The `nix nar` command provides subcommands for creating and inspecting Nix Archives (NARs). The file format for Nix Archives is defined in the protocols chapter of the Nix manual.