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Valentin Gagarin 2023-05-11 15:29:03 +02:00
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doc/manual/src/language/builtin-constants.md
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Here are the constants built into the Nix expression evaluator: Here are the constants built into the Nix expression evaluator:
- `builtins`\ - `builtins`\
The set `builtins` contains all the built-in functions and values. The set `builtins` contains all the built-in functions and values.
You can use `builtins` to test for the availability of features in You can use `builtins` to test for the availability of features in
the Nix installation, e.g., the Nix installation, e.g.,
```nix ```nix
if builtins ? getEnv then builtins.getEnv "PATH" else "" if builtins ? getEnv then builtins.getEnv "PATH" else ""
``` ```
This allows a Nix expression to fall back gracefully on older Nix This allows a Nix expression to fall back gracefully on older Nix
installations that don’t have the desired built-in function. installations that don’t have the desired built-in function.
- [`builtins.currentSystem`]{#builtins-currentSystem}\ - [`builtins.currentSystem`]{#builtins-currentSystem}\
The built-in value `currentSystem` evaluates to the Nix platform The built-in value `currentSystem` evaluates to the Nix platform
identifier for the Nix installation on which the expression is being identifier for the Nix installation on which the expression is being
evaluated, such as `"i686-linux"` or `"x86_64-darwin"`. evaluated, such as `"i686-linux"` or `"x86_64-darwin"`.