Hadoop: usage: help for a command

“usage” command is used to get help for a command.

Usage:

hadoop fs [generic options] -usage [cmd ...]

$ hadoop fs -usage cat
Usage: hadoop fs [generic options] -cat [-ignoreCrc] <src> ...
$ 
$ hadoop fs -usage put
Usage: hadoop fs [generic options] -put [-f] [-p] [-l] <localsrc> ... <dst>
$ 
$ hadoop fs -usage get
Usage: hadoop fs [generic options] -get [-p] [-ignoreCrc] [-crc] <src> ... <localdst>
$ 
$ hadoop fs -usage usage
Usage: hadoop fs [generic options] -usage [cmd ...]

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