代码：

按行写文件

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f, err := os.OpenFile(fileName,
os.O_WRONLY|os.O_CREATE|os.O_TRUNC, os.ModePerm)
if err != nil {
	return
}
w := bufio.NewWriter(f)
fmt.Fprintln(w, fmt.Sprintf("start analysis log at the %s \r\n", `"`+logFileDir+`"`))
w.Flush()

按行读文件

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buf := bufio.NewReader(file)
for {
	line, err := buf.ReadString('\n')
	line = strings.TrimSpace(line)
	if err != nil {
		if err == io.EOF { //读取结束，会报EOF
			return nil
		}
		return err
	}
}