The default command line interface for Ubuntu Linux is called bash (Bourne Again Shell), and in order to add Java environment variables, we will edit a file named “.bashrc” and add our commands inside, here we go:
- Edit the “.bashrc” file by typing “sudo gedit .bashrc” which will open gedit; the famous Linux text editor in Read/Write mode (Note: If you don’t use the keyword sudo to get administrative privileges, then the file will be opened in Read Only mode)
- Scroll to the end of the file and add your env. variables as in the following example which I used to define the JAVA_HOME env. variable:
- Append this line to the end of the .bashrc file: “export JAVA_HOME=/usr/lib/jvm/java-6-sun” where I point this variable to the location of my default JDK
- Save the file and exit and close the terminal
- Reopen the terminal and to check that everything went fine, type the following command: “echo $JAVA_HOME” which should result in displaying “/usr/lib/jvm/java-6-sun”, otherwise, repeat the process again, you must have done something wrong.