想必大家在命令行操作mysql的时候会十分发愁现在的操作的是那个数据库吧，至少我就纠结过，可能您会说我打一条命令不就知道了，是的这样做确实可以的。
可是今儿给大家介绍个好用的命令--prompt
复制代码 代码如下:
[root@fsailing1 ~]# mysql -uroot -p --prompt="\\u@\\h:\\d \\r:\\m:\\s>"
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 378
Server version: 5.0.95 Source distribution

Copyright (c) 2000, 2011, 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.

root@localhost:(none) 08:23:32>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
root@localhost:test 08:23:44>exit;

这样做的好处就是让我们大家在操作数据库时更加方便快捷。

您也可以在在my.cnf配置文件里进行配置：
复制代码 代码如下:
[mysql]
prompt=mysql(\\u@\\h:\\d)>

default-character-set=utf8

复制代码 代码如下:
[root@fsailing1 ~]# vim /etc/my.cnf
[root@fsailing1 ~]# service mysqld restart
停止 MySQL： [确定]
启动 MySQL： [确定]
[root@fsailing1 ~]# mysql -uroot -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.0.95 Source distribution

Copyright (c) 2000, 2011, 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(root@localhost:(none))>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(root@localhost:test)>

这里也给出需要的一些个选项供大家参考。
OptionDescription\cA counter that increments for each statement you issue\DThe full current date\dThe default database\hThe server host\lThe current delimiter (new in 5.1.12)\mMinutes of the current time\nA newline character\OThe current month in three-letter format (Jan, Feb, …)\oThe current month in numeric format\Pam/pm\pThe current TCP/IP port or socket file\RThe current time, in 24-hour military time (0–23)\rThe current time, standard 12-hour time (1–12)\SSemicolon\sSeconds of the current time\tA tab character\U

Your fulluser_name@host_nameaccount name

\uYour user name\vThe server version\wThe current day of the week in three-letter format (Mon, Tue, …)\YThe current year, four digits\yThe current year, two digits\_A space\A space (a space follows the backslash)\'Single quote\"Double quote\\A literal “\” backslash character\x

x, for any “x” not listed above