How to check JAVA_HOME environment variable under Cent OS 7

Question

The manual of Collabnet says that we have to setup JAVA_HOME environment variable. How to check if this variable has been configured already?

1. Set the JAVA_HOME environment variable, and point it to your Java 6 JRE
      home.  For example:

      export JAVA_HOME=/usr/java/default

      Test the variable:

      $ $JAVA_HOME/bin/java -version
      java version "1.6.0_20"
      Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
      Java HotSpot(TM) Client VM (build 16.3-b01, mixed mode, sharing)

Solution

How do I to check if JAVA_HOME has been configured already?

There are many ways to do this.

In a bash shell you can use any of the following commands:

echo $JAVA_HOME

printf $JAVA_HOME

env | grep JAVA_HOME

printenv | grep JAVA_HOME

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Further Reading

• An A-Z Index of the Bash command line for Linux - An excellent reference for all things Bash command line related.

Comments

[DavidPostill]

env | grep JAVA_HOME