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eidt /etc/profile:[root@localhost ~]$sudo vi /etc/profileexport JAVA_HOME=/usr/local/javaexport CLASSPATH=.:/usr/local/java/lib/rj.jarexport PATH=$PATH:$JAVA_HOME/binthen:[root@localhost ~]# source /etc/profile

[ruoyang@localhost ~]$ sudo passwd rootChanging password for user root.New password: Retype new password: passwd: all authentication tokens updated successfully.然后su root，输入刚刚设置的密码即可