1.rpm -qa|grep -i mysql
2.
service mysql stop
/etc/init.d/mysql shutdown
service mysqld stop
/etc/init.d/mysqld shutdown
3.rpm -ev MySQL-client-5.5.25a-1.rhel5
rpm -e –nodeps MySQL-server-5.5.25a-1.rhel5 (-nodeps强制删)
4.find / -name mysql
rm -rf /var/lib/mysql
rm -rf /usr/lib64/mysql 等
rm -rf /etc/my.cnf
5.rpm -qa|grep -i mysql
6.yum list | grep mysql
7.yum install mysql
8.yum install mysql-server
9.rpm -qi mysql-server
10./etc/init.d/mysqld start 等
11.mysql [-uroot -p]
12.select user();
13.show grants for root@localhost;
14.update user set password=password(‘123′) where user=’root’;
15.FLUSH PRIVILEGES;
16.GRANT ALL PRIVILEGES ON db.* TO ‘user_name’@’%’ IDENTIFIED BY ‘abc’ WITH GRANT OPTION;
1.which java（whereis java）
2.
[shell]
$ ls -l /usr/bin/java
lrwxr-xr-x 1 root wheel 74 Jan 4 20:24 /usr/bin/java -> /System/Library/Frameworks/JavaVM.framework/Versions/Current/Commands/java
[/shell]
3.
[shell]
$ ls -l /System/Library/Frameworks/JavaVM.framework/Versions
total 64
lrwxr-xr-x 1 root wheel 10 5 11 2014 1.4 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 5 11 2014 1.4.2 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 5 11 2014 1.5 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 5 11 2014 1.5.0 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 5 11 2014 1.6 -> CurrentJDK
lrwxr-xr-x 1 root wheel 10 5 11 2014 1.6.0 -> CurrentJDK
drwxr-xr-x 8 root wheel 272 5 12 2014 A
lrwxr-xr-x 1 root wheel 1 5 11 2014 Current -> A
lrwxr-xr-x 1 root wheel 59 5 11 2014 CurrentJDK -> /System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents
[/shell]
4.$ /usr/libexec/java_home
5.$ /usr/libexec/java_home -V
6.$ vim ~/.profile
[shell]
JAVA_HOME=`/usr/libexec/java_home`
export JAVA_HOME
[/shell]