Append text to a file

This code appends a line of text to the file text.log. It creates the file if it doesn’t already exist.

f, err := os.OpenFile("text.log",	os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644) if err != nil {	log.Println(err) } defer f.Close() if _, err := f.WriteString("text to append\n"); err != nil {	log.Println(err) } 

If you’re appending text to a file for logging purposes, see Write log to file.