How to Parse Command-Line Flags in Go

Use the flag package to define variables, call flag.Parse(), and access the values directly.

package main

import (
	"flag"
	"fmt"
)

func main() {
	name := flag.String("name", "World", "A greeting name")
	count := flag.Int("count", 1, "Number of greetings")
	flag.Parse()

	for i := 0; i < *count; i++ {
		fmt.Printf("Hello, %s\n", *name)
	}
}

Run with go run main.go -name=Go -count=3.

The flag package lets your program accept custom inputs from the command line, like a name or a number. You define what inputs you expect, and the package automatically handles parsing them when the program starts. Think of it like a form where users fill in boxes before the program runs.