Go provides a basic library called flag. It refers to the command-line flags. Since it is already packed with the Go distribution, there is no need to install anything externally. We can see the absolute basics of writing the command-line tool. The flag package has multiple functions, such as Int and String, to handle the input given as command-line flags. Suppose we need to take a name from the user and print it back to the console. We use the flag.String method, as shown in the following code snippet:
import "flag"
var name = flag.String("name", "No Namer", "your wonderful name")Let us write a short program for clear details. Create a file called flagExample.go in your $GOPATH/src/github.com/narenaryan and add the following content:
package main
import (
"flag"
"log"
)
var name = flag.String("name", "stranger", "your wonderful name")
func main(){
flag.Parse()
log.Printf("Hello %s, Welcome to the command line world", *name)
}In this...