I am learning Hadoop with book 'Hadoop in Action' by Chuck Lam. In first chapter the books says that Hadoop installation will have example jar and by running 'hadoop jar hadoop-\*-examples.jar' will show all the examples. But when I run the command then it throw error 'Could not find or load main class org.apache.hadoop.util.RunJar'. My guess is that installed Hadoop doesn't have example jar. I have installed 'hadoop-2.1.0-beta.tar.gz' on cygwin on Win 7 laptop. Please suggest how to get example jar.