lp - line printer
The lp device refers to the line printer attached to the parallel port.
Any byte written to this device is printed. Only one process may have
the device open.
The write (2) call may return with a smaller count then the number of
bytes requested to write. The next write call is then likely to fail
with the error code EAGAIN if the printer is out of paper, or EIO if the
printer is turned off.
/dev/lp Parallel port device.
Only one parallel port is supported.
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