[Go] gocron源码阅读-flag包实现命令行参数获取

调用flag包能够方便的获取到命令行中传递的参数，好比能够实现相似nginx执行程序获取命令行参数执行不一样操做的目标

package main

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

func main() {
    var h bool
    var c, s string
    flag.BoolVar(&h, "h", false, "帮助信息")
    flag.StringVar(&c, "c", "conf/nginx.conf", "设置配置文件：")
    flag.StringVar(&s, "s", "", "管理服务：reload|restart|start|stop")
    flag.Parse()
    if h {
        fmt.Fprintf(os.Stdout, "nginx version: nginx/%s\n", "100.0.0")
        flag.PrintDefaults()
    }
    if c != "" {
        fmt.Println("-c参数是", c)
    }
    if s != "" {
        fmt.Println("-s参数是", s)
    }
}