JAVA_HOME variable shows a blank line on the terminal
I'm using Ubuntu 16.04 64-bit. I'm logged in to Ubuntu as user1. I installed Oracle JDK version jdk1.8.0_144 to /usr/local/java and set symlinks as
$ sudo update-alternatives --install "/usr/bin/java" "java" "/usr/local/java/jdk1.8.0_144/jre/bin/java" 1
$ sudo update-alternatives --install "/usr/bin/javac" "javac" "/usr/local/java/jdk1.8.0_144/bin/javac" 1
$ sudo update-alternatives --install "/usr/bin/javaws" "javaws" "/usr/local/java/jdk1.8.0_144/jre/bin/javaws" 1
$ sudo update-alternatives --set java /usr/local/java/jdk1.8.0_144/jre/bin/java
$ sudo update-alternatives --set javac /usr/local/java/jdk1.8.0_144/bin/javac
$ sudo update-alternatives --set javaws /usr/local/java/jdk1.8.0_144/jre/bin/javawsThen, I opened .bashrc file with sudo nano ~/.bashrc and added the following lines to the end of the file:
export JAVA_HOME=/usr/local/java/jdk1.8.0_144
export PATH=${JAVA_HOME}/bin:${PATH}and saved by typing Ctrl+O.
However, when I type echo $JAVA_HOME, terminal shows a blank line. I closed and opened the .bashrc file and the two lines are still there, so I did save the file properly I think.
1 Answer
The ~/.bashrc file is read once every time a new interactive non-login shell is started. In other words, every time you open a new terminal or just run bash in an already opened terminal. So any changes you have made there won't take effect until you open a new terminal to start a new bash session.
Alternatively, you can source the file in your current session with:
. ~/.bashrcThat said, never open files with sudo unless necessary and it is never necessary for ~/.bashrc. Make sure the file still belongs to your user (ls -l ~/.bashrc), change ownership if needed (chown swdon:swdon ~/.bashrc) and get into the habit of never using sudo unless you know it is necessary.
