Go uses flag package to parse command line parameters

The goal is ： Parsing command line arguments

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analysis ：

os.Args yes string The section of , All command line parameters can be stored , But it's not convenient to use . You can use it flag package , Parsing commands with parameters .

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Result output ：

var (
	pwd string
	host string
	port int
	user string
)
flag.StringVar(&user,"u","","username ,default empty")
flag.StringVar(&pwd,"pwd","","password ,default empty")
flag.StringVar(&host,"u","localhost","username ,default localhost")
flag.IntVar(&port,"port",3306,"post default 3306")

// This method must be called 
flag.Parse()
fmt.Printf("user=%v pwd=%v host=%v port=%v",user,pwd,host,port)