help - provide on-line information on commands
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   help [-a] [-h] [<command>]

   Given  no arguments, "help" prints a list of all commands known to the
   command interpreter. If a command name is given, detailed information for
   that command will be provided.

   Command options:

   -a
          Provides a list of all internal commands, which by convention begin
          with an underscore.

   -h
          Print the command usage.
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   Last updated on 20100410 00h02