redhat 下安装jdk的shell脚本

每次都要卸载系统跟随的openjdk然后装orcle的jdk实在烦人，所以

编写一个脚本执行就省心了，只要将下面的bash脚本和你所在下载的

jdk-7u79-linux-x64.tar.gz包放在同一个文件夹即可。

别忘记，给脚本执行权限

#chmod +x shellname.sh

#../shellname.sh

#!/bin/bash

#shell script to install jdk 

# 1. remove openjdk if exists.

for i in $(rpm -qa | grep openjdk | grep -v grep)

do

 echo "Deleting rpm -> "$i

 rpm -e --nodeps $i

done

if [[ ! -z $(rpm -qa | grep jdk | grep -v grep) ]];

then

 echo "-->Failed to remove the defult Jdk."

else

# 2.tar and install JDK(jdk-7u79-linux-x64.tar.gz)

 tar -zxvf jdk-7u79-linux-x64.tar.gz

 mkdir /usr/java

 mv ./jdk1.7.0_79 /usr/java/jdk1.7.0_79

 rm -rf ./jdk1.7.0_79

# 3. config /etc/profile

 echo "export JAVA_HOME=/usr/java/jdk1.7.0_79" >>/etc/profile

 echo -e 'export CLASSPATH=.:$JAVA_HOME/jre/lib/rt.jar:$JAVA_HOME/lib/dt.jar:$JAVA_HOME/lib/tools.jar'>>/etc/profile

 echo -e 'export PATH=$PATH:$JAVA_HOME/bin'>>/etc/profile

 source /etc/profile

fi