mysql开启命令行日志（可以记录source等的日志）
mysql> tee hello.log
mysql>select now() ;
mysql>exit; //退出mysql 客户端
查看 hello.log 文件内容如下：
mysql> select now();
用法如下：
Step 1: Login to MySQL
Step 2: In the MySQL command prompt, type the below command.
mysql> tee log.out
Logging to file 'log.out'
mysql>
You should see a message “Logging to file” displayed on the screen.
Step 3: Now, source the SQL file
mysql> source sample.sql
Step 4: The output of source command would have been logged into a file log.out.
Step 5: View the log.out
$ more log.out
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