Device Entries

• A device entry is in many ways the same as a regular file.
• If you try to copy a device entry using cp, though, you'll read bytes from the device (if the device supports reading) and write them to the destination file.
• If you try to overwrite a device entry, you'll write bytes to the corresponding device instead.
• You can create a device entry in the file system using the mknod command.
• Creating a device entry in the file system doesn't automatically imply that the corresponding device driver or hardware device is present or available; the device entry is merely a portal for communicating with the driver, if it's there.

  $ mknod ./lp0 c 6 0
  $ ls -l lp0
  $ rm ./lp0