Command-line for append
-----------------------

                 Key: HADOOP-6239
                 URL: https://issues.apache.org/jira/browse/HADOOP-6239
             Project: Hadoop Common
          Issue Type: New Feature
          Components: fs
            Reporter: Koji Noguchi


Once append is implemented in hdfs, it would be nice if users can append files 
from a command-line. 
Either have a separate 'append' command or add '-append' option for 'put' and 
'cp'

Like,  
% cat mylocalfile  | hadoop dfs -put -append - /user/knoguchi/myfile    ('-' 
for stdin)
% hadoop dfs -cp -append myhdfsfile1 myhdfsfile2  


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