003-linux the JDK installation process

Note: RPM and software-related commands are equivalent to software Assistant management software under Windows

1 See if the current Linux system has Java installed

1) in the command window, you can view the OPENJDK version information that comes with the system.

Java-version

2) You can also view the Java files installed on the Linux system by typing the name on the command line

Rpm-qa | grep java

Name Interpretation: Rpm-qa | grep java

RPM Management Suite

-qa use Inquiry mode to query all packages

Grep finds eligible strings in a file

Java finds files that contain Java strings

2 Uninstall two openjdk installed on the Linux system

1) Enter the command rpm-e--nodeps the software to be uninstalled

The name of the software to uninstall

Noarch files can not be deleted

Command explanation:

RPM Management Suite

-e Delete the specified package

--nodeps does not verify the correlation of the suite files

3 uploading JDK to Linux system is done directly on the Remote connection tool

4 Creating the Java installation directory under Usr/local

5unzip the JDK to/usr/local/java

has been extracted to the specified folder

6 Modifying file names

The original is a bit too long, the name modification is shorter.

7 Configuring Environment variables

1 at the command line type: Vim/etc/profile Enter file---naming mode

Vim/etc/profile

Command Description:

Vim text editing

/etc/profile global variable file

into the text editing state, the cursor goes to the last line of the file, the keyboard press I:-----edit mode--"Edit the file

I

Paste the following content code in:

Note:java_home=/usr/local/java/jdk1.7 This is the installation directory for your JAVA files.

#set Java Environmentjava_home=/usr/local/java/jdk1.7classpath=.: $JAVA _home/lib.tools.jarpath= $JAVA _ Home/bin: $PATHexport java_home CLASSPATH PATH

After pasting in, press ESC to enter the bottom row mode

Input: Then enter Wq write and save

8 Let the environment variable you just set take effect

Type the following command:

Source/etc/profile

9 Verify that the configuration is successful

Here, the JDK under Linux is installed successfully.

003-linux the JDK installation process