Commit d7db230

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Add basic usage of flag package

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	`1`	`+package main`
	`2`	`+`
	`3`	`+import (`
	`4`	`+ "flag"`
	`5`	`+ "fmt"`
	`6`	`+)`
	`7`	`+`
	`8`	`+var (`
	`9`	`+ // Return a point which can read by *name after flag.Parse() executed`
	`10`	`+ name = flag.String("name", "unknow", "your name")`
	`11`	`+)`
	`12`	`+`
	`13`	`+func main() {`
	`14`	`+ flag.Parse()`
	`15`	`+`
	`16`	`+ // Create a visitor function, execute with a *flag.Flag callback param for each flag`
	`17`	`+ visitor := func(f *flag.Flag) {`
	`18`	`+ fmt.Println("option =", f.Name, " value =", f.Value)`
	`19`	`+ }`
	`20`	`+ flag.VisitAll(visitor)`
	`21`	`+`
	`22`	`+ fmt.Println(*name)`
	`23`	`+}`
	`24`	`+`
	`25`	`+// cmd : go run main.go -name tmpbook`
	`26`	`+// output:`
	`27`	`+// option = name value = tmpbook`
	`28`	`+// tmpbook`
	`29`	`+`
	`30`	`+// cmd : go run main.go`
	`31`	`+// output:`
	`32`	`+// option = name value = unknow`
	`33`	`+// unknow`

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