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2nd digit
indicates function groupings.
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‘0’: Syntax
(problem with command syntax).
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‘1’:
Information (reply to help or
status cmds).
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‘2’: Connections
(problem with a connection).
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‘3’:
Authentication (problem with login).
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‘4’: Unspecified.
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‘5’: File system
(related to file system).
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3rd digit
indicates specific problem within
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function group.
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