golang 命令行

cli.go

package main

import (
	"flag"
	"fmt"
	"os"
)

func main() {
	var (
		hello string
		world string
		yes   bool
	)

	flag.StringVar(&hello, "hello", "", "hello text")
	flag.StringVar(&world, "world", "world", "world text")
	flag.BoolVar(&yes, "y", false, "yes to bool")

	textPtr := flag.String("text", "", "Text to parse. (Required)")
	metricPtr := flag.String("metric", "chars", "Metric {chars|words|lines};. (Required)")
	uniquePtr := flag.Bool("unique", false, "Measure unique values of a metric.")

	flag.Parse()

	if *textPtr == "" {
		flag.PrintDefaults()
		os.Exit(1)
	}

	fmt.Printf("textPtr: %s, metricPtr: %s, uniquePtr: %t\n", *textPtr, *metricPtr, *uniquePtr)
}

/*
输出如下：

  -hello string                                                       
        hello text                                                    
  -metric string                                                      
        Metric {chars|words|lines};. (Required) (default "chars")     
  -text string                                                        
        Text to parse. (Required)                                     
  -unique                                                             
        Measure unique values of a metric.                            
  -world string                                                       
        world text (default "world")                                  
  -y    yes to bool         
  
*/