1、在linux中已经安装好mysql，通过#ps -ef |ｇrep mysql 能显示mysql已经启动，但去进入mysql命令页面出现如下问题：
1 [root@root ~]# mysql u -p 2 -bash: mysql: command not found
查找mysql是否已经启动
1 [root@root ~]# ps -ef | grep mysql 2 root 1172 1 0 18:28 ? 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/service/mysql --pid-file=/service/mysql/root.pid 3 mysql 1285 1172 9 18:28 ? 00:00:01 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/service/mysql --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/service/mysql/root.err --pid-file=/service/mysql/root.pid 4 root 1440 1288 0 18:28 pts/1 00:00:00 grep mysql
原因:这是由于系统默认会查找/usr/bin下的命令，如果这个命令不在这个目录下，当然会找不到命令，我们需要做的就是映射一个链接到/usr/bin目录下，相当于建立一个链接文件。
首先得知道mysql命令或mysqladmin命令的完整路径，比如mysql的路径是：/usr/local/mysql/bin/mysql，【此路经是mysql实际安装路径】我们则可以这样执行命令
1 [root@root bin]# ln -fs /usr/local/mysql/bin/mysql /usr/bin/
1 [root@root bin]# mysql -u -p 2 Welcome to the MySQL monitor. Commands end with ; or \g. 3 Your MySQL connection id is 1 4 Server version: 5.6.20 Source distribution 5 6 Copyright (c) 2000, 2014, Oracle and/or its affiliates. All rights reserved. 7 8 Oracle is a registered trademark of Oracle Corporation and/or its 9 affiliates. Other names may be trademarks of their respective 10 owners. 11 12 Type ‘help;‘ or ‘\h‘ for help. Type ‘\c‘ to clear the current input statement. 13 14 mysql> Ctrl-C -- exit! 15 Aborted
原文：http://www.cnblogs.com/lcj0703/p/6255169.html