Operation and MaintenanceLinux Operation and MaintenanceDetailed 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.
Instructions:
install means installation
link is a symbolic link
name is the identifier
path is the path to the executable file
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 4Explanation:
/usr/bin/java is the path of the java command, use which java to view, the corresponding parameter java corresponding parameter3. Use alternatives --config java to check whether the installation of java 1.8.0 is 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 theFour: Use java -version to view the selected version
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