Global option use case

GenerateCommand.cs

using System.CommandLine;

public class GenerateCommand : Command
{
    public GenerateCommand(Option<string> envOption) : base("generate", "A generator description")
    {
        this.AddCommand(new GenerateMessageCommand(envOption));
    }
}

GenerateMessageCommand.cs

using System.CommandLine;

public class GenerateMessageCommand : Command
{
    public GenerateMessageCommand(Option<string> envOption) : base("message", "Generates messages")
    {
        this.AddOption(envOption);
        this.AddCommand(new Command("order", "Generates order messages"));
        this.AddCommand(new GenerateStockMessageCommand(envOption));
    }
}

GenerateStockMessageCommand.cs

using System.CommandLine;

public class GenerateStockMessageCommand : Command
{
    public GenerateStockMessageCommand(Option<string> env) : base("stock", "Generates stock messages")
    {
        this.AddOption(env);
    }
}

Program.cs

// See https://aka.ms/new-console-template for more information
using System.CommandLine;

Console.WriteLine("Hello, World!");

var globalOption = new Option<string>("--env", "An environment override");

var rootCommand = new RootCommand
{
    new GenerateCommand(globalOption)
};

rootCommand.AddGlobalOption(globalOption);

return rootCommand.Invoke(args);