package main import ( "fmt" "github.com/urfave/cli" "os" ) func main() { app := cli.NewApp() app.Name = "myapp" app.Usage = "a simple CLI app" app.Flags = []cli.Flag{ cli.BoolFlag{ Name: "flagname, f", Usage: "description", }, } app.Action = func(c *cli.Context) error { flagValue := c.Bool("flagname") fmt.Println("Flag Value: ", flagValue) return nil } err := app.Run(os.Args) if err != nil { fmt.Println(err) } }The above code is an example of using `Context Bool` with `github.com/urfave/cli`. It declares a bool flag named `flagname` with a shorthand option `-f`, which can be set to either true or false by the user. When executed, the program will print out the value of the `flagname` option. For instance, if the user runs `myapp -f`, it will output `Flag Value: true`. In conclusion, `github.com/urfave/cli` is a useful package library for creating powerful command line tools in Go. The `Context Bool` type is just one of its many features that make it a great choice for developers looking to build user-friendly CLI applications.