本文详细介绍了Hadoop的版本及其在不同场景下的应用，包括配置文件操作、jar包使用、命令执行流程等关键步骤。
$ mkdir input
$ cp conf/*.xml input
$ bin/hadoop jar hadoop-0.20.2-examples.jar grep input output 'dfs[a-z.]+'
$ cat output/*
hadoop-0.20.2
bin/hadoop jar hadoop-0.20.2-examples.jar grep input output 'dfs[a-z.]+'
hadoop-0.20.203.0
bin/hadoop jar hadoop-examples-0.20.203.0.jar grep input output 'dfs[a-z.]+'
hadoop-0.21.0
bin/hadoop jar hadoop-mapred-examples-0.21.0.jar grep input output 'dfs[a-z.]+'
hadoop-1.0.0
bin/hadoop jar hadoop-examples-1.0.0.jar grep input output 'dfs[a-z.]+'
hadoop-1.0.0-bin
bin/hadoop jar share/hadoop/hadoop-examples-1.0.0.jar grep input output 'dfs[a-z.]+'
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