Set CLASSPATH for running Java class in Ubuntu

General, to run a java class which require class from JAR file library, you have to type full command as follow:

java -classpath /home/huypv/Desktop/my-lib.jar HelloWorld

If you always use my-lib.jar for other projects, you sould add it to CLASSPATH to execute Java class quickly and easily via command.

# We add jar library to CLASSPATH, all current libs are not changed.
export CLASSPTH=$CLASSPATH:/home/huypv/Desktop/my-lib.jar

#Now, execute java class with short command
java HelloWorld