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docs: give translation examples from nix-build -E/-A to installables

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Change-Id: I03f4c7c1049063539a35ba500a07bb8f866d4cb7
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Qyriad 2024-04-29 08:15:52 -06:00
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src/nix/nix.md
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@ -162,6 +162,12 @@ When the option `-f` / `--file` *path* \[*attrpath*...\] is given, installables
If attribute paths are provided, commands will operate on the corresponding values accessible at these paths. If attribute paths are provided, commands will operate on the corresponding values accessible at these paths.
The Nix expression in that file, or any selected attribute, must evaluate to a derivation. The Nix expression in that file, or any selected attribute, must evaluate to a derivation.
To emulate the `nix-build '<nixpkgs>' -A hello` pattern, use:
```console
$ nix build -f '<nixpkgs>' hello
```
### Nix expression ### Nix expression
Example: `--expr 'import <nixpkgs> {}' hello` Example: `--expr 'import <nixpkgs> {}' hello`
@ -172,6 +178,12 @@ The Nix expression, or any selected attribute, must evaluate to a derivation.
You may need to specify `--impure` if the expression references impure inputs (such as `<nixpkgs>`). You may need to specify `--impure` if the expression references impure inputs (such as `<nixpkgs>`).
To emulate the `nix-build -E 'with import <nixpkgs> { }; hello' pattern use:
```console
$ nix build --impure -E 'with import <nixpkgs> { }; hello'
```
## Derivation output selection ## Derivation output selection
Derivations can have multiple outputs, each corresponding to a Derivations can have multiple outputs, each corresponding to a