nix-env:tldr:08686

The command "nix-env -i ${pkg_name} --file ${example-com}" is used to install a package named "${pkg_name}" from a Nix expression file named "${example-com}".

Here is a breakdown of each part of the command:

1. "nix-env" is the Nix package manager's command-line tool for managing Nix packages on your system.

2. "-i" is a flag/option used with "nix-env" to specify that we want to install a package.

3. "${pkg_name}" is a placeholder for the name of the package that you want to install. You would replace "${pkg_name}" with the actual name of the package you want to install.

4. "--file" is another flag/option used with "nix-env" to specify that we want to install the package from a Nix expression file, rather than using the default Nix channels.

5. "${example-com}" is a placeholder for the name of the Nix expression file that contains the package definition. You would replace "${example-com}" with the actual name of the Nix expression file.

In summary, this command installs a package from a specific Nix expression file onto your system using the Nix package manager.