Add command line help for -expunge command. -------------------------------------------
Key: HDFS-809
URL: https://issues.apache.org/jira/browse/HDFS-809
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Ravi Phulari
Fix For: 0.21.0, 0.22.0
Command line help for *hadoop fs -expunge* command is missing.
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