fs := gnuflag.NewFlagSet("myapp", gnuflag.ExitOnError)
var debug bool fs.BoolVar(&debug, "debug", false, "enable debug mode")In this example, we define a boolean flag "debug" with a default value of "false" and a description of "enable debug mode". We also use the "BoolVar" function to bind this flag to the variable "debug". Overall, the "github.com.juju.gnuflag" package provides useful functionality for handling command line arguments and flags in Go, making it easy to write command line tools and applications.