golang 获取当前路径和上一级父路径（目录）

package main

import (
	"fmt"
	"log"
	"os"
	"path/filepath"
	"strings"
)

func substr(s string,pos,length int) string {
	runes := []rune(s)
	l := pos + length
	if l > len(runes) {
		l = len(runes)
	}
	return string(runes[pos:l])
}

func getParentDirectory(dirctory string) string {
	return substr(dirctory,strings.LastIndex(dirctory,"/"))
}

func getCurrentDirectory() string {
	dir,err := filepath.Abs(filepath.Dir(os.Args[0]))
	if err != nil {
		log.Fatal(err)
	}
	return strings.Replace(dir,"\\","/",-1)
}

func main() {

	var str1,str2 string
	str1 = getCurrentDirectory()

	str2 = getParentDirectory(str1)
	fmt.Println(str2)

}