Detailed explanation of how to use Linux alternatives command to replace the version of selected software

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When I installed search engine Elasticsearch last week, I was asked to install a newer java version. I chose java 1.8.0 , after successfully installing java, use java -version and find that the version used is still 1.6.0.

query some information and find that you can use the Linux alternatives command to replace the selected software version.

Instructions:

alternatives --install < priority>

Among them,

install means installation

link is a symbolic link

name is the identifier

path is the path to the executable file

priority means priority

1: Let’s first look at the current java version

2: Use Linux alternatives command to install java 1.8.0

1. First use alternatives to view the current situation What java versions are there in the system?

alternatives --config java

2. Use the alternatives command to install java 1.8.0

alternatives --install /usr/bin/java java /usr/local/java/jre1.8.0_131/bin/java 4

Explanation:

/usr/bin/java is the path of the java command, use which java to view, the corresponding parameter

java corresponding parameter

/usr/local/java/jre1.8.0_131/bin/java corresponds to , indicating the path of the java command of java1.8.0

The number 4 corresponds to the parameter , because there is already 3 programs provide java, so you need to write 4

3. Use alternatives --config java to check whether the installation of java 1.8.0 is successful

The java underlined in red is the one I just installed, indicating that the installation was successful

3: Select the java version

alternatives --config The result seen by java

is the same as the result of 2(3). Pay attention to the last sentence in English: Enter to keep the

current selection[+], or type selection number, which translates to press Enter key to save the current selection [+], or to step through the selected number. I type the number 4 to indicate that I choose to use java 1.8.0

Four: Use java -version to view the selected version

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