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A file is a named entry in a file system, having an
implementation-defined nature.
A filename is a handle, not necessarily ever directly represented as an
object, that can be used to refer to a file in a file system (file)
truename tries to find the file indicated by filespec and
returns its truename. If the filespec designator is an open
stream, its associated file is used.
FILESPECa pathname designator. If filespec is a pathname it represents the name used to open the file
TRUENAMEa physical pathname