详解MySQL的tee功能 并利用其记录相关操作
由于经常对mysql数据库进行大量的更改操作，比如更改字段，添加或删除索引等等，我们把这些操作放到sql语句中，然后登陆mysql，通过source执行该sql文件，为了做好相关记录，方便以后的工作中进行核对查询，将MySQL中sql运行结果保存到文件，类似Oracle sqlplus中利用spool的功能，方法大致如下，仅供参考：
1、登陆mysql之后
mysql> \T mysql_result.log
Logging to file 'mysql_result.log'
或者
mysql> tee mysql_result.log
Logging to file 'mysql_result.log'
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> \h
For information about MySQL products and services, visit:
http://www.mysql.com/
For developer information, including the MySQL Reference Manual, visit:
http://dev.mysql.com/
To buy MySQL Enterprise support, training, or other products, visit:
https://shop.mysql.com/
List of all MySQL commands:
Note that all text commands must be first on line and end with ';'
? (\?) Synonym for `help'.
clear (\c) Clear the current input statement.
connect (\r) Reconnect to the server. Optional arguments are db and host.
delimiter (\d) Set statement delimiter.
edit (\e) Edit command with $EDITOR.
ego (\G) Send command to mysql server, display result vertically.
exit (\q) Exit mysql. Same as quit.
go (\g) Send command to mysql server.
help (\h) Display this help.
nopager (\n) Disable pager, print to stdout.
notee (\t) Don't write into outfile.
pager (\P) Set PAGER [to_pager]. Print the query results via PAGER.
print (\p) Print current command.
prompt (\R) Change your mysql prompt.
quit (\q) Quit mysql.
rehash (\#) Rebuild completion hash.
source (\.) Execute an SQL script file. Takes a file name as an argument.
status (\s) Get status information from the server.
system (\!) Execute a system shell command.
tee (\T) Set outfile [to_outfile]. Append everything into given outfile.
use (\u) Use another database. Takes database name as argument.
charset (\C) Switch to another charset. Might be needed for processing binlog with multi-byte charsets.
warnings (\W) Show warnings after every statement.
nowarning (\w) Don't show warnings after every statement.
For server side help, type 'help contents'