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In UNIX, every output device is referred to as a file.
For writing to the console (the monitor), the file to write to is
/dev/console. To write to tape, the file is /dev/nrst0
(on a Sun SPARCstation 2).
Even the keyboard writes to a file (/dev/kbd) which is read by the
operating system.
Claude Cantin
2010-10-24