Linux uninstall system comes with JDK awesome article

Built-in JDK for Linux uninstall

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[Root @ localhost soft] # Java-version

Java version "1.4.2 ″

Gij (GNU libgcj) version 4.1.2 20071124 (Red Hat 4.1.2-42)

Note: According to my installation in 5.2, it seems that the built-in 1.4 is not uninstalled, and the installation of JDK 6 cannot take effect. To avoid this problem, we first need to uninstall JDK 1.4.

[Root @ localhost soft] # rpm-Qa | grep JDK

[Root @ localhost soft] # rpm-Qa | grep gcj

Libgcj-4.1.2-42.el5

Java-1.4.2-gcj-compat-1.4.2.0-40jpp.115

First confirm the specific JDK version number, and then

[Root @ localhost jdk1.6.0 _ 11] # Yum-y remove java-1.4.2-gcj-compat-1.4.2.0-40jpp.115

Setting up remove Process

Resolving dependencies ........... (Start to uninstall)

Removed: java-1.4.2-gcj-compat.i386. 4.2.0-40jpp. 115

Dependency removed: anlr. i386 0: 2. 7.6-4jpp. 2 BSF. i386 0: 2. 3.0-11jpp. 1 bsh. i386 0: 1. 3.0-9jpp. 1 gjdoc. i386 0: 0. 7.7-12. EL5 HSQLDB. i386 1:1. 8.0.9-1jpp. 2 OpenOffice.org-Calc. i386

. 3.0-container OpenOffice.org-core. i386. 3.0-container OpenOffice.org-draw. i386. 3.0-container OpenOffice.org-graphicfilter. i386. 3.0-6.5.el5 OpenOffice.org-impress. i386

. 3.0-6.5.el5 OpenOffice.org-langpack-zh_CN.i386. 3.0-6.5.el5 OpenOffice.org-langpack-zh_TW.i386. 3.0-6.5.el5 OpenOffice.org-math. i386. 3.0-6.5.el5 OpenOffice.org-

Writer. i386. 3.0-6.5.el5 OpenOffice.org-effectfilter. i386. 3.0-6.5.el5 tomcat5-jsp-2.0-api.i386. 5.23-0jpp. 7. EL5 tomcat5-servlet-2.4-api.i386. 5.23-0jpp. 7. EL5 xalan-

J2.i386. 7.0-6jpp. 1 xerces-j2.i386. 7.1-7jpp. 2 xml-commons-apis.i386. 3.02-0. b2.7jpp. 10 xml-commons-resolver.i386. 1-1jpp.12

Complete! (Uninstall completed)

The installation package I am using is a jdk-6u11-linux-i586.bin and does not use a general RPM package for the Red Hat platform.

First, upload the jdk-6u11-linux-i586.bin to/home/xjj/soft over ssh. Then, to give the jdk-6u11-linux-i586.bin

Assign permissions, specifically here to give it executable permissions, input: chmod + x jdk-6u11-linux-i586.bin, where the parameter x even executes permissions.

[Root @ localhost soft] # chmod + x jdk-6u11-linux-i586.bin

Then unzip:./jdk-6u11-linux-i586.bin,

[Root @ localhost soft] #./jdk-6u11-linux-i586.bin

After the execution, there will be a bunch of agreement or something, all the way more. Then there is a confirm installation, enter yes, and then press Enter. Start decompression. Until

Java (TM) se Development Kit 6 successfully installed.

.........

Press enter to continue .....

Done.

Look at the extracted files first

[Root @ localhost soft] # ls

Jdk1.6.0 _ 11 jdk-6u11-linux-i586.bin

[Root @ localhost soft] # cd jdk1.6.0 _ 11

[Root @ localhost jdk1.6.0 _ 11] # ls

Bin DB include lib man readme_ja.html register.html register_zh_cn.html src.zip

Copyright demo JRE license readme.html readme_zh_cn.html register_ja.html sample thirdpartylicensereadme.txt

Haha, You can decompress what we are familiar. Generally, the installation file is stored in usr/local. Of course you can't take it if you don't. Therefore, run the Copy command first:

[Root @ localhost soft] # mv jdk1.6.0 _ 11/usr/local

[Root @ localhost xjj] # cd ../..

[Root @ localhost/] # ls

Bin Dev home lost + found MISC net proc sbin srv tmp VaR

Boot etc lib media MNT opt root SELinux sys USR

[Root @ localhost/] # cd/usr/local

[Root @ localhost local] # ls

Bin etc games include jdk1.6.0 _ 11 lib libexec sbin share SRC

Now, JDK has been successfully moved to/usr/local, and the last step is to set the environment variable. There are two in-process settings, one is to temporarily take effect through the Export settings, restart

Subsequent settings will be lost. One is to write the settings to the/etc/profile file, which can always take effect. Therefore, the best setting is to write to the file. Run the following command:

[Root @ localhost jdk1.6.0 _ 11] # vi/etc/profile

Open the profile file, enter I to enter insert mode, and add the following content to the file.

Export java_home =/usr/local/jdk1.6.0 _ 11

Export Path = $ path: $ java_home/bin

Export classpath =.: $ java_home/lib/tools. jar: $ java_home/lib/RT. Jar

Then run ESC, enter: X, save and exit. Then you need to set the change to take effect:

[Root @ localhost local] # source/etc/profile

Of course, if you like to restart, you can also reboot.

Let's take a look at the current JDK version:

[Root @ localhost local] # Java-version

Java version "1.6.0 _ 11 ″

Java (TM) se Runtime Environment (build 1.6.0 _ 11-b03)

Java hotspot (TM) Client VM (build 11.0-f8, mixed mode, sharing)

Success!