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What does dfs[a-z]+ do?

Question asked by nikhil_krishnan on Aug 2, 2012
Latest reply on Aug 2, 2012 by nabeel
I am new to ubuntu. Recently I installed Hadoop and am on the process of learning it. I am making use of the page:http://hadoop.apache.org/common/docs/r1.0.3/single_node_setup.html. I came across the line
bin/hadoop jar hadoop-examples-*.jar grep input output 'dfs[a-z.]+'      
Can someone explain what grep and dfs[a-z]+ do in the above line?  

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