package main

import (
	"flag"
	"fmt"
	"strings"
)

type StringSlice2 []string

func (s *StringSlice2) Set(val string) error {
	*s = append(*s, val)
	return nil
}

func (s *StringSlice2) String() string {
	return strings.Join(*s, ",")
}

func main() {
	var files StringSlice2
	flag.Var(&files, "file", "指定多个配置文件，可重复传参")
	flag.Parse()
	fmt.Printf("文件列表：%#v\n", files)
}