Install and uninstall JDK in Linux (jdk-6u16 -)

1. install JDK: first download the installation package from the sun website: Composer

1. install JDK:

First download the installation package from the sun website:

Https://cds.sun.com/is-bin/INTERSHOP.enfinity/WFS/CDS-CDS_Developer-Site/en_US/-/USD/ViewFilteredProducts-SingleVariationTypeFilter

 

Download: jdk-6u16-linux-i586-rpm.bin and jdk-6u16-linux-i586.bin

 

Then place the two installation files in the/usr/tmp directory and modify the permissions respectively. the command is as follows:

# Chmod u + x./jdk-6u16-linux-i586.bin

# Chmod u + x./jdk-6u16-linux-i586-rpm.bin

 

Decompress the file (these two files can be automatically decompressed ):

#./Jdk-6u16-linux-i586.bin

 

Create directory/usr/java:

# Mkdir/usr/java

 

Copy the unzipped jdk-6u16-linux-i586 directory to the/usr/java Directory:

# Cp-fr jdk-6u16-linux-i586/usr/java

 

Decompress the file

#./Jdk-6u16-linux-i586-rpm.bin

 

The installation software automatically installs JDK under the/usr/java/jdk-6u16-linux-i586 Directory

 

 

2. configure environment variables

 

1. modify user environment variables

 

Assume that the user using java is guest, and edit the user's. bashrc file to set environment variables.

 

# Vi/home/guest/. bashrc

 

Add the following to the. bashrc file:

 

Export JAVA_HOME =/usr/java/jdk1.6.0 _ 16

Export CLASSPATH = $ CLASSPATH: $ JAVA_HOME/lib: $ JAVA_HOME/jre/lib

Export PATH = $ JAVA_HOME/bin: $ JAVA_HOME/jre/bin: $ PATH: $ HOMR/bin

 

2. modify the environment variables of all users

 

# Vi/etc/profile

 

Add:

 

Export JAVA_HOME =/usr/java/jdk1.6.0 _ 16

Export CLASSPATH = $ CLASSPATH: $ JAVA_HOME/lib: $ JAVA_HOME/jre/lib

Export PATH = $ JAVA_HOME/bin: $ JAVA_HOME/jre/bin: $ PATH: $ HOMR/bin

 

Note that $ CLASSPATH is added to the CLASSPATH path to avoid overwriting the previously configured path.

 

The profile file is as follows:

########### Profile begin ###########

#/Etc/profile

 

# System wide environment and startup programs, for login setup

# Functions and aliases go in/etc/bashrc

 

Pathmunge (){

If! Echo $ PATH |/bin/egrep-q "(^ |:) $1 ($ |:)"; then

If ["$2" = "after"]; then

PATH = $ PATH: $1

Else

PATH = $1: $ PATH

Fi

Fi

}

 

# Ksh workaround

If [-z "$ EUID"-a-x/usr/bin/id]; then

EUID = 'id-U'

UID = 'id-ru'

Fi

 

# Path manipulation

If ["$ EUID" = "0"]; then

Pathmunge/sbin

Pathmunge/usr/sbin

Pathmunge/usr/local/sbin

Fi

 

# No core files by default

Ulimit-S-c 0>/dev/null 2> & 1

 

If [-x/usr/bin/id]; then

USER = "'id-un '"

LOGNAME = $ USER

MAIL = "/var/spool/mail/$ USER"

Fi

 

HOSTNAME = '/bin/hostname'

History size = 1000

 

If [-z "$ INPUTRC"-! -F "$ HOME/. inputrc"]; then

INPUTRC =/etc/inputrc

Fi

 

Export PATH USER LOGNAME MAIL HOSTNAME HISTSIZE INPUTRC

 

# Java path

Export JAVA_HOME =/usr/java/jdk1.6.0 _ 16

Export CLASSPATH = $ CLASSPATH: $ JAVA_HOME/lib: $ JAVA_HOME/jre/lib

Export PATH = $ JAVA_HOME/bin: $ JAVA_HOME/jre/bin: $ PATH: $ HOMR/bin

 

For I in/etc/profile. d/*. sh; do

If [-r "$ I"]; then

. $ I

Fi

Done

 

Unset I

Unset pathmunge

 

############ Profile end ###########

 

 

 

III. uninstall jkd:

1. uninstall the built-in jdk Version:

View the built-in jdk:

# Rpm-qa | grep gcj

The following information is displayed:

Libgcj-4.1.2-44.el5

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

 

Run the rpm-e -- nodeps command to delete the content found above:

# Rpm-e? Cnodeps java-1.4.2-gcj-compat-1.4.2.0-40jpp.115

 

 

2. uninstall the jkd version installed by rpm

View the installed jdk:

# Rpm-qa | grep jdk

The following information is displayed:

Java-1.6.0-openjdk-1.6.0.0-0.25.b09.el5

Jdk-1.6.0_16-fcs

 

Uninstall:

# Rpm-e -- nodeps jdk-1.6.0_16-fcs