Consequently,
these commands can be exceptionally destructive.
Understanding Command Line Devices
You can access a number of devices from the command line. Some devices accept input, others output,
and some accept both. These devices always reference a physical device of some type. In some cases, the
device isn??™t attached to your machine, but it??™s accessible from your machine, such as a network printer.
Many commands and utilities let you use a device in place of a drive letter as an argument. For example,
the
Copy
command lets you use input from a device to create a file. You can also use a file as output to
a device. Here??™s the standard list of command line devices.
CON
The system console, which is the combination of keyboard and monitor used to access the
computer system. Input comes from the keyboard and output goes to the monitor.
PRN
The default printer. You must configure network printers to provide a port to support a command
line device. The port appears on the Ports tab of the network printer??™s Properties dialog box.
Even if your printer can provide bidirectional communication, the PRN device is only capable of
output.
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