undef_system_command(command) public

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# File lib/shell/command-processor.rb, line 374
    def self.undef_system_command(command)
      command = command.id2name if command.kind_of?(Symbol)
      remove_method(command)
      Shell.module_eval{remove_method(command)}
      Filter.module_eval{remove_method(command)}
      self
    end
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