1、 vi /etc/profile
提供复制指令:
JAVA_HOME=/usr/local/java/jdk1.8.0_191
export CATALINA_HOME=/usr/local/tomcat/apache-tomcat-8.5.3
export CATALINA_BASE=/usr/local/tomcat/apache-tomcat-8.5.3
export CLASSPATH=.:$JAVA_HOME/lib:$CATALINA_HOME/lib
export PATH=$PATH:$JAVA_HOME/bin:$PATH:$CATALINA_HOME/bin
2保存后,退出 :wq
[root@ora-rac2 ~]# source /etc/profile 牢记,这部一定要执行!!!!!