package main
import (
 "fmt"
 "log"
 "os"
)
func main(){
 logfile,err := os.OpenFile("/var/golang/jb51.net.log",os.O_RDWR|os.O_CREATE,0);
 if err!=nil {
  fmt.Printf("%s\r\n",err.Error());
  os.Exit(-1);
 }
 defer logfile.Close();
 logger := log.New(logfile,"\r\n",log.Ldate|log.Ltime|log.Llongfile);
 logger.Println("hello");
 logger.Println("oh....");
 logger.Fatal("test");
 logger.Fatal("test2");
}