Output UserID and Effective User ID

user.go

package main

import (
	"fmt"
	"os"
)

func main() {
	fmt.Printf("User ID: %d\n", os.Getuid()) // 実ユーザID
	fmt.Printf("Group ID: %d\n", os.Getgid())
	fmt.Printf("Effective User ID: %d\n", os.Geteuid()) // 実効ユーザID
	fmt.Printf("Effective Group ID: %d\n", os.Getegid())
}