show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema | 
| test               | 
+--------------------+
---
 ps -aux|grep mysql
Warning: bad syntax, perhaps a bogus '-'? See /usr/share/doc/procps-3.2.7/FAQ
root     17773  0.0  0.1   3704   528 pts/2    S+   03:31   0:00 tail -f /var/log/mysqld.log
root     18113  0.0  0.2   4488  1196 pts/1    S    03:43   0:00 /bin/sh /usr/bin/mysqld_safe --defaults-file=/etc/my.cnf --pid-file=/var/run/mysqld/mysqld.pid --log-error=/var/log/mysqld.log
mysql    18149  0.1  3.5 137036 18236 pts/1    Sl   03:43   0:00 /usr/libexec/mysqld --defaults-file=/etc/my.cnf --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --skip-external-locking --socket=/var/lib/mysql/mysql.sock
root     18169  0.0  0.0   3836   460 pts/1    R+   03:44   0:00 grep mysql

---

 vi /etc/my.cnf

[mysqld]
datadir=/var/lib/mysql
socket=/var/lib/mysql/mysql.sock
# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
old_passwords=1

[mysql.server]
user=mysql
basedir=/var/lib

[mysqld_safe]
log-error=/var/log/mysqld.log
pid-file=/var/run/mysqld/mysqld.pid