在MySQL命令行中，使用tee命令，可以記錄語句和輸出到指定文件。在debugging時會很有用。
每執行一條語句，mysql都會講執行結果刷新到指定文件。Tee功能只在交互模式生效。

mysql> tee /tmp/20160908.log
Logging to file '/tmp/20160908.log'
mysql> show databases;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:    4
Current database: test

+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+
4 rows in set (0.01 sec)

mysql> use test
Database changed
mysql> show tables;
+--------------------+
| Tables_in_test     |
+--------------------+
| ADDSubscribers     |
| Subscribers        |
| dept               |
| emp                |
| t10                |
| t2                 |
| t5                 |
| t50                |
| t7                 |
| test               |
| tmp_Subscribers_01 |
| tmp_Subscribers_02 |
| tmp_Subscribers_03 |
| version            |
+--------------------+
14 rows in set (0.00 sec)

mysql> select * from emp;
+-------+--------+-----------+------+---------------------+------+------+--------+
| empno | ename  | job       | mgr  | hiredate            | sal  | com  | deptno |
+-------+--------+-----------+------+---------------------+------+------+--------+
|  7369 | SMITH  | CLERK     | 7902 | 1980-12-17 00:00:00 |  800 | NULL |     20 |
|  7499 | ALLEN  | SALESMAN  | 7698 | 1981-02-20 00:00:00 | 1600 |  300 |     30 |
|  7521 | WARD   | SALESMAN  | 7698 | 1981-02-22 00:00:00 | 1250 |  500 |     30 |
|  7566 | JONES  | MANAGER   | 7839 | 1981-04-02 00:00:00 | 2975 | NULL |     20 |
|  7654 | MARTIN | SALESMAN  | 7698 | 1981-09-28 00:00:00 | 1250 | 1400 |     30 |
|  7698 | BLAKE  | MANAGER   | 7839 | 1981-05-01 00:00:00 | 2850 | NULL |     30 |
|  7782 | CLARK  | MANAGER   | 7839 | 1981-06-09 00:00:00 | 2450 | NULL |     10 |
|  7788 | SCOTT  | ANALYST   | 7566 | 1987-07-13 00:00:00 | 3000 | NULL |     20 |
|  7839 | KING   | PRESIDENT | NULL | 1981-11-17 00:00:00 | 5000 | NULL |     10 |
|  7844 | TURNER | SALESMAN  | 7698 | 1981-09-08 00:00:00 | 1500 |    0 |     30 |
|  7876 | ADAMS  | CLERK     | 7788 | 1987-07-13 00:00:00 | 1100 | NULL |     20 |
|  7900 | JAMES  | CLERK     | 7698 | 1981-12-03 00:00:00 |  950 | NULL |     30 |
|  7902 | FORD   | ANALYST   | 7566 | 1981-12-03 00:00:00 | 3000 | NULL |     20 |
|  7934 | MILLER | CLERK     | 7782 | 1982-01-23 00:00:00 | 1300 | NULL |     10 |
+-------+--------+-----------+------+---------------------+------+------+--------+
14 rows in set (0.03 sec)

使用notee命令來關閉日志記錄
mysql> notee
Outfile disabled.

查看生成的日志
[root@localhost fire]# cat /tmp/20160908.log
mysql> show databases;
ERROR 2006 (HY000): MySQL server has gone away
No connection. Trying to reconnect...
Connection id:    4
Current database: test

+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| performance_schema |
| test               |
+--------------------+
4 rows in set (0.01 sec)

mysql> use test
Database changed
mysql> show tables;
+--------------------+
| Tables_in_test     |
+--------------------+
| ADDSubscribers     |
| Subscribers        |
| dept               |
| emp                |
| t10                |
| t2                 |
| t5                 |
| t50                |
| t7                 |
| test               |
| tmp_Subscribers_01 |
| tmp_Subscribers_02 |
| tmp_Subscribers_03 |
| version            |
+--------------------+
14 rows in set (0.00 sec)

mysql> select * from emp;
+-------+--------+-----------+------+---------------------+------+------+--------+
| empno | ename  | job       | mgr  | hiredate            | sal  | com  | deptno |
+-------+--------+-----------+------+---------------------+------+------+--------+
|  7369 | SMITH  | CLERK     | 7902 | 1980-12-17 00:00:00 |  800 | NULL |     20 |
|  7499 | ALLEN  | SALESMAN  | 7698 | 1981-02-20 00:00:00 | 1600 |  300 |     30 |
|  7521 | WARD   | SALESMAN  | 7698 | 1981-02-22 00:00:00 | 1250 |  500 |     30 |
|  7566 | JONES  | MANAGER   | 7839 | 1981-04-02 00:00:00 | 2975 | NULL |     20 |
|  7654 | MARTIN | SALESMAN  | 7698 | 1981-09-28 00:00:00 | 1250 | 1400 |     30 |
|  7698 | BLAKE  | MANAGER   | 7839 | 1981-05-01 00:00:00 | 2850 | NULL |     30 |
|  7782 | CLARK  | MANAGER   | 7839 | 1981-06-09 00:00:00 | 2450 | NULL |     10 |
|  7788 | SCOTT  | ANALYST   | 7566 | 1987-07-13 00:00:00 | 3000 | NULL |     20 |
|  7839 | KING   | PRESIDENT | NULL | 1981-11-17 00:00:00 | 5000 | NULL |     10 |
|  7844 | TURNER | SALESMAN  | 7698 | 1981-09-08 00:00:00 | 1500 |    0 |     30 |
|  7876 | ADAMS  | CLERK     | 7788 | 1987-07-13 00:00:00 | 1100 | NULL |     20 |
|  7900 | JAMES  | CLERK     | 7698 | 1981-12-03 00:00:00 |  950 | NULL |     30 |
|  7902 | FORD   | ANALYST   | 7566 | 1981-12-03 00:00:00 | 3000 | NULL |     20 |
|  7934 | MILLER | CLERK     | 7782 | 1982-01-23 00:00:00 | 1300 | NULL |     10 |
+-------+--------+-----------+------+---------------------+------+------+--------+
14 rows in set (0.03 sec)

mysql> notee

當調用mysql時，使用--tee參數，可以記錄這個登錄會話的全部日志。
[root@localhost ~]# mysql -uroot -p --tee=/tmp/20160908_02.log
Logging to file '/tmp/20160908_02.log'
Enter password:
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.6.31-77.0-log Percona Server (GPL), Release 77.0, Revision 5c1061c

Copyright (c) 2009-2016 Percona LLC and/or its affiliates
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from test;
+------+-------+
| id   | name  |
+------+-------+
|   10 | neo   |
|   20 | John  |
|   30 | Lucy  |
|   40 | Larry |
|   50 | Lilly |
+------+-------+
5 rows in set (0.04 sec)

查看生成的日志
[root@localhost fire]# cat /tmp/20160908_02.log
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.6.31-77.0-log Percona Server (GPL), Release 77.0, Revision 5c1061c

Copyright (c) 2009-2016 Percona LLC and/or its affiliates
Copyright (c) 2000, 2016, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use test
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select * from test;
+------+-------+
| id   | name  |
+------+-------+
|   10 | neo   |
|   20 | John  |
|   30 | Lucy  |
|   40 | Larry |
|   50 | Lilly |
+------+-------+
5 rows in set (0.04 sec)

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