Check for file existense

EazyLink Server, V4.5

This request command performs a file check of the specified file name in the Z88 filing system.

If the specified file exists, an ESC "Y" is returned, otherwise ESC "Z" indicating failure.

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Client                    Server                Action
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<ESC "f">                                       Does file exist?
<File><ESC "Z">       ->  waiting
                                                finding file...

waiting               <-  <ESC "Y">             File found.
                                                or
waiting               <-  <ESC "Z">             File not found.
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