COPY

Copies one or more files to another location.

COPY [/A | /B] source [/A | /B] [+ source [/A | /B] [+ ...]] [destination
  [/A | /B]] [/V] [/N]

  source       Specifies the file or files to be copied.
  /A           Indicates an ASCII text file.
  /B           Indicates a binary file.
  destination  Specifies the directory and/or filename for the new file(s).
  /V           Verifies that new files are written correctly.
  /N           Uses short filename, if available, when copying a file with a
               non-8dot3 name.
  /Z           Copies networked files in restartable mode.

To append files, specify a single file for destination, but multiple files
for source (using wildcards or file1+file2+file3 format).

To copy a file to a local port, use 
COPY filename portname /B
If the port is an ethernet or USB port, first share the printer in Start / Settings / Printers and Faxes by right clicking
the printer icon, then selecting Sharing and setting it to be shared with a name that has no spaces, then 
COPY filename \\127.0.0.1\sharename /B

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See also:

•  http://geekswithblogs.net/dtotzke/articles/26204.aspx