初学，关于linux下使用mysql以及卸载的问题

1./etc/inin.d/mysql start命令：
出现：Starting MySQL..The server quit without updating PID file (/var/lib/mysql/localhost.localdomain.pid). 

2.[root@localhost /]# mysql
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/var/lib/mysql/mysql.sock' (2)

3.[root@localhost /]# rpm -evh MySQL-server-5.5.15-1.linux2.6
rpm: --hash (-h) may only be specified during package installation
通过rpm文件安装，但卸载时出现上面提示，不知何意~~~~


问题可能有点白，但是还是拜托各位大牛拉！~~~

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