golang 中flag包的使用

1. go build -o cmd a.go

2. ./cmd -h

 

3. ./cmd -name=golanm m123g -age 4 -vip=true -pop 99 简洁 高并发 等等 asdfasfdaf adfa safa adfa fafda adfsafsaf 111111111111111

 

 

 

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package main import "flag" import "fmt" import "strconv" type percentage float32 func (p *percentage) Set(s string) error {   v, err := strconv.ParseFloat(s, 32)   *p = percentage(v)   return err } func (p *percentage) String() string { return fmt.Sprintf("%f", *p) } func main() {   namePtr := flag.String("name", "lyh", "user's name")   agePtr := flag.Int("age", 22, "user's age")   vipPtr := flag.Bool("vip", true, "is a vip user")   var email string   flag.StringVar(&email, "email", "lyhopq@gmail.com", "user's email")   var pop percentage   flag.Var(&pop, "pop", "popularity")   flag.Parse()   others := flag.Args()   fmt.Println("name:", *namePtr)   fmt.Println("age:", *agePtr)   fmt.Println("vip:", *vipPtr)   fmt.Println("pop:", pop)   fmt.Println("email:", email)   fmt.Println("other:", others) }