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Ok, you are doing alright. You just need to specify full path to the hadoop-examples.jar file, like that:

hadoop jar /usr/share/hadoop/<...>/hadoop-examples-1.2.1.jar pi 10 100

Don't forget to replace '<...>' in command I've proposed with the actual path, so that /usr/share/hadoop/<...>/hadoop-examples-1.2.1.jar a full path for hadoop-examples.jar.