| Processes user input.
This class executes user commands and sends replies.
When dealing with exceptions from command executions, this class must
not throw exceptions, instead it must send to user replies with error messages.
Note that error from a filesystem class are not always errors producing
default LOCAL ERROR reply. That is because filesystem is unable to
post replies and it communicates back using a special kind of exceptions.
ColoradoFTP - The Open Source FTP Server (http://cftp.coldcore.com)
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