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docs: installable remove alternate expression flag (#11254)

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8
src/nix/nix.md
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@ -65,7 +65,7 @@ The following types of installable are supported by most commands:
- [Nix file](#nix-file), optionally qualified by an attribute path - [Nix file](#nix-file), optionally qualified by an attribute path
- Specified with `--file`/`-f` - Specified with `--file`/`-f`
- [Nix expression](#nix-expression), optionally qualified by an attribute path - [Nix expression](#nix-expression), optionally qualified by an attribute path
- Specified with `--expr`/`-E` - Specified with `--expr`
For most commands, if no installable is specified, `.` is assumed. For most commands, if no installable is specified, `.` is assumed.
That is, Nix will operate on the default flake output attribute of the flake in the current directory. That is, Nix will operate on the default flake output attribute of the flake in the current directory.
@ -200,17 +200,17 @@ operate are determined as follows:
… …
``` ```
For `-e`/`--expr` and `-f`/`--file`, the derivation output is specified as part of the attribute path: For `--expr` and `-f`/`--file`, the derivation output is specified as part of the attribute path:
```console ```console
$ nix build -f '<nixpkgs>' 'glibc^dev,static' $ nix build -f '<nixpkgs>' 'glibc^dev,static'
$ nix build --impure -E 'import <nixpkgs> { }' 'glibc^dev,static' $ nix build --impure --expr 'import <nixpkgs> { }' 'glibc^dev,static'
``` ```
This syntax is the same even if the actual attribute path is empty: This syntax is the same even if the actual attribute path is empty:
```console ```console
$ nix build -E 'let pkgs = import <nixpkgs> { }; in pkgs.glibc' '^dev,static' $ nix build --impure --expr 'let pkgs = import <nixpkgs> { }; in pkgs.glibc' '^dev,static'
``` ```
* You can also specify that *all* outputs should be used using the * You can also specify that *all* outputs should be used using the