[LINUX] How to find if you don't know the Java installation directory

I lost track of the installation directory on the server for various reasons.

Method 1: View the environment variable JAVA_HOME

This is OK if you are using the version you are currently using (the version that works with the java command).

$ printenv JAVA_HOME

Method 2: Look at the environment variable PATH

If the version you are currently using (the version that works with the java command) does not have JAVA_HOME, this is OK.

$ printenv PATH | sed -e 's/:/:\n/g' | grep java

Method 3: Search by package name installed with yum

It's common to have multiple versions installed. When you want to find a version of Java that is not set to JAVA_HOME.

Reference: Check the installation location of packages installed with yum-I have never worked hard when I was a student

#Check installed packages from version
$ yum list installed | grep java-1.7
java-1.7.0-openjdk.x86_64  1:

#Check the installation directory
$ rpm -ql java-1.7.0-openjdk-devel.x86_64 | grep bin

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