gistfile1.go

package main

import (
	"fmt"
	"github.com/codegangsta/cli"
	"os"
)

func main() {
	app := cli.NewApp()

	app.Name = "test"
	app.Usage = "test"
	app.CommandNotFound = func(context *cli.Context, command string) {
		fmt.Printf("command not found: %s", command)
	}
	app.Commands = []cli.Command{
		Example,
	}
	app.Run(os.Args)
}

var Example = cli.Command{
	Name:        "example",
	Usage:       "example",
	Description: "example",
	Subcommands: []cli.Command{
		exampleCMD,
	},
}

var exampleCMD = cli.Command{
	Name:        "sub",
	Usage:       "sub",
	Description: "sub",
	Action:      nil,
}