Redesign FsShell
----------------

                 Key: HADOOP-7176
                 URL: https://issues.apache.org/jira/browse/HADOOP-7176
             Project: Hadoop Common
          Issue Type: Bug
    Affects Versions: 0.22.0
            Reporter: Daryn Sharp
             Fix For: 0.22.0


The FsShell commands are very tightly coupled together which makes it 
necessarily hard to write new commands.  There is a lot of redundancy between 
the commands, inconsistencies in handling of paths, handling of errors, and 
correct return of exit codes.  The FsShell commands should be subclasses of the 
fs.shell.Command class which is already being used by the -count command, and 
is used by other commands like dfsadmin.

This will serve as an umbrella bug to track the changes.

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