Appendix B
List of Logical Device Identifiers
AUX:
CON:
PRN:
NUL:
COM1
COM2
LPT1
LPT2
LPT3
Refers
to
input from or output to an auxiliary
device. This could be another computer if you
have two machines connected together for trans-
ferring files.
For 'console'
or
terminal, including keyboard and
display (Input/Output).
If
using as an input device
(keyboard), there is a key-combination to indi-
cate 'end
of
input' (see Appendix C).
This 'listing' or 'print' device such as a printer.
Does not refer to any particular file or device.
NUL
is used when the syntax
of
a command requires
that a filename is specified even though the file is
not to be used.
It
is useful for testing applications:
as an input device it simulates end-of-file immedi-
ately; as an output device it simulates successful
writing of data without data actually being written.
Serial port
Serial port
Parallel printer port
Parallel printer port
Parallel printer port
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