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nix eval — Evaluate a Nix expression and print the result to `stdout`. More information: <https://nix.dev/manua

Submitted by: @import:tldr-pages·Mar 2, 2026·

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commandevaluatenix evalandcliexpressionprintnix

Problem

How to use the nix eval command: Evaluate a Nix expression and print the result to stdout. More information: <https://nix.dev/manual/nix/stable/command-ref/new-cli/nix3-eval.html>.

Solution

nix eval — Evaluate a Nix expression and print the result to stdout. More information: <https://nix.dev/manual/nix/stable/command-ref/new-cli/nix3-eval.html>.

Evaluate Nix flake attributes in the current directory:

nix eval .#{{attributes}}

Evaluate a given Nix expression:

nix eval --expr '{{your_expression}}'

Evaluate a Nix expression from a specified file:

nix eval --file {{path/to/file}}

Print the store path of the specified package from nixpkgs:

nix eval {{nixpkgs#pkg}} --raw

Evaluate attributes from a flake directly from GitHub:

nix eval {{github:owner/repo#attributes}}

Evaluate a given lambda function passing the specified package as argument:

nix eval {{nixpkgs#pkg}} --apply '{{lambda_function}}'

Code Snippets

Evaluate Nix flake attributes in the current directory

nix eval .#{{attributes}}

Evaluate a given Nix expression

nix eval --expr '{{your_expression}}'

Evaluate a Nix expression from a specified file

nix eval --file {{path/to/file}}

Print the store path of the specified package from nixpkgs

nix eval {{nixpkgs#pkg}} --raw

Evaluate attributes from a flake directly from GitHub

nix eval {{github:owner/repo#attributes}}

Context

tldr-pages: common/nix eval

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