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nix/doc/manual/src/command-ref/nix-env/opt-common.md
Valentin Gagarin b975151c09 dedent lists 
this indentation is unnecessary and probably an artefact from the
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Options

The following options are allowed for all nix-env operations, but may not always have an effect.

  • --file / -f path

    Specifies the Nix expression (designated below as the active Nix expression) used by the --install, --upgrade, and --query --available operations to obtain derivations. The default is ~/.nix-defexpr.

    If the argument starts with http:// or https://, it is interpreted as the URL of a tarball that will be downloaded and unpacked to a temporary location. The tarball must include a single top-level directory containing at least a file named default.nix.

  • --profile / -p path

    Specifies the profile to be used by those operations that operate on a profile (designated below as the active profile). A profile is a sequence of user environments called generations, one of which is the current generation.

  • --dry-run

    For the --install, --upgrade, --uninstall, --switch-generation, --delete-generations and --rollback operations, this flag will cause nix-env to print what would be done if this flag had not been specified, without actually doing it.

    --dry-run also prints out which paths will be substituted (i.e., downloaded) and which paths will be built from source (because no substitute is available).

  • --system-filter system

    By default, operations such as --query --available show derivations matching any platform. This option allows you to use derivations for the specified platform system.