=================Compiling Everything============================================================

cd the folder then execute : 

$ mkdir shortest_path_classes (if not already existing)

$ javac -classpath ${HADOOP_HOME}/hadoop-core-${HADOOP_VERSION}.jar:$HADOOP_HOME/lib/commons-cli-1.2.jar -d shortest_path_classes ShortestPath.java


=================Extracting Jar Components ======================================================

 jar -cvf shortest_path.jar -C shortest_path_classes/ .

================Executing the Code ==============================================================

$ ${HADOOP_HOME}/bin/hadoop jar shortest_path.jar ShortestPath input output   (Check evrytime you execute that the OUTPUTS OF PREVIOUS EXECUTION ARE DELETED)