CentOS 7 linux 卸载和安装JDK 运行jar

[color=orange]解决所有命令失效[/color]
把不识别的命令所在文件添加到临时环境变量中,
如 PATH=$PATH:/bin:/usr/bin

[color=orange]后台运行jar[/color]
nohup java -jar test.jar >temp.txt &

[color=orange]查看某端口占用的线程的pid[/color]
netstat -nlp |grep :6069

#JAVA_HOME=/usr/java/jdk1.6.0_45;export JAVA_HOME
JAVA_HOME=/usr/java/jdk1.7.0_79;export JAVA_HOME 
#CLASSPATH=$JAVA_HOME/lib;export CLASSPATH
CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar;export CLASSPATH 
PATH=$JAVA_HOME/bin:$PATH;export PATH
JRE=$JAVA_HOME/jre;export JRE 

[color=red]Root login ![/color]
# rpm -qa|grep jdk
java-1.8.0-openjdk-1.8.0.45-30.b13.el7_1.x86_64
java-1.7.0-openjdk-1.7.0.79-2.5.5.2.el7_1.x86_64
java-1.7.0-openjdk-headless-1.7.0.79-2.5.5.2.el7_1.x86_64
java-1.7.0-openjdk-devel-1.7.0.79-2.5.5.2.el7_1.x86_64
java-1.8.0-openjdk-headless-1.8.0.45-30.b13.el7_1.x86_64
jdk-1.6.0_45-fcs.x86_64
java-1.8.0-openjdk-devel-1.8.0.45-30.b13.el7_1.x86_64
# rpm -e jdk-1.6.0_45-fcs.x86_64
# rpm -ivh jdk-7u79-linux-x64.rpm
# cd jdk1.7.0_79/
# vi /home/latte/.bashrc
# source /home/latte/.bashrc
=======================================================================
JAVA_HOME=/usr/java/jdk1.7.0_79;export JAVA_HOME
CLASSPATH=$JAVA_HOME/lib/tools.jar:$JAVA_HOME/lib/dt.jar;export CLASSPATH
PATH=$JAVA_HOME/bin:$PATH;export PATH
JRE=$JAVA_HOME/jre;export JRE
=======================================================================

[img]http://dl.iteye.com/upload/picture/pic/133409/70114920-585e-36e0-bf40-0fb2270fece1.png[/img]