quick golang log to file

main.go

import (
  "fmt"
  "log"
  "os"
)

func debug(s string, o ...interface{}) {
	f, err := os.OpenFile("/tmp/debug.log",
		os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		log.Println(err)
	}
	defer f.Close()
	fmt.Fprintf(f, s+"\n", o...)
}