C语言中sizeof与strlen区别

MySQL登陆后提示符的修改

方法一：mysql命令行修改方式

mysql>prompt \u@night \r:\m:\s->PROMPT set to '\u@night \r:\m:\s->'root@night 04:52:47->root@night 04:53:26->helpFor 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.修改mysql提示符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'root@night 04:53:38->

方法二：通过shell命令行修改

[root@localhost data]# mysql -u root -p'www.123' --prompt="\u@\h:\d-->"Welcome to the MySQL monitor.Commands end with ; or \g.Your MySQL connection id is 8Server version: 5.5.27 Source distributionCopyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.root@localhost:(none)-->

方法三：配置文件修改方法

[root@localhost data]# tail -2 /etc/my.cnf [mysql]prompt=\\u@night\\r:\\m:\\s->[root@localhost data]#
[root@localhost data]# mysql -uroot -p'www.123'Welcome to the MySQL monitor.Commands end with ; or \g.Your MySQL connection id is 9Server version: 5.5.27 Source distributionCopyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.root@night07:11:51->提示：不需要重新启动数据库，只需要关闭数据库重新启动就可以了。
注意：在配置文件中要加反斜杠以屏蔽特殊意义。

方法四：通过环境变量修改

[root@localhost data]# tail -1 /etc/profileexport MYSQL_PS1="(\u@\h) [\d]-->"[root@localhost data]# source /etc/profile[root@localhost data]# mysql -uroot -p'www.123'Welcome to the MySQL monitor.Commands end with ; or \g.Your MySQL connection id is 12Server version: 5.5.27 Source distributionCopyright (c) 2000, 2011, Oracle and/or its affiliates. All rights reserved.Oracle is a registered trademark of Oracle Corporation and/or itsaffiliates. Other names may be trademarks of their respectiveowners.Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.(root@localhost) [(none)]-->

格式解释：

通过man mysql 得到如下内容：

option	description
\c	A counter that increments for each statement you issue
\D	The full current date
\d	The default database
\h	The server host
\l	The current delimiter
\m	Minutes of the current time
\n	A newline character
\O	The current month in three-letter format (Jan, Feb, ...)
\o	The current month in numeric format
\P	am/pm
\p	The current TCP/IP port or socket file
\R	The current time, in 24-hour military time (0–23)
\r	The current time, standard 12-hour time (1–12)
\S	Semicolon
\s	Seconds of the current time
\t	A tab character
\U	Your full user_name@host_name account name
\u	Your user name
\v	The server version
\w	The current day of the week inthree-letter format (Mon, Tue, ...)
\Y	The current year, four digits
\y	The 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

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