output.txt

fgblomqvist:Desktop$ ./test help cmd
NAME:
   test cmd - 

USAGE:
   test cmd [command options] [arguments...]

OPTIONS:
   --flag1 value  Foo
   --flag2 value  Bar
   
fgblomqvist:Desktop$ ./test cmd help
NAME:
   test cmd - 

USAGE:
   test cmd [global options] command [command options] [arguments...]
   
VERSION:
   0.0.0
   
COMMANDS:
     test  

GLOBAL OPTIONS:
   --flag1 value  Foo
   --flag2 value  Bar
   --help, -h     show help
   
fgblomqvist:Desktop$ ./test cmd -h
fgblomqvist:Desktop$ ./test cmd --help
fgblomqvist:Desktop$ 

test.go

package main

import (
	"gopkg.in/urfave/cli.v1"
	"os"
)

func main() {

	app := cli.NewApp()

	app.Commands = []cli.Command{
		{
			Name: "cmd",
			Flags: []cli.Flag{
				cli.StringFlag{
					Name: "flag1",
					Usage: "Foo",
				},
				cli.StringFlag{
					Name: "flag2",
					Usage: "Bar",
				},
			},
			Action: func(c *cli.Context) error {
				return nil
			},
			Subcommands: []cli.Command{
				{
					Name: "test",
				},
			},
		},
	}

	app.Run(os.Args)
}