Ken
The command is copy, with a parameter of /b (signifying that the data may contain binary (non-graphic) characters).
i.e. there should be (at least) one space between the two.
... and the escape sequence <Esc>&k2S (meaning set "Pitch Mode: Compressed (16.67 cpi)" is considered to be an obsolete sequence (replaced by various font selection characteristic sequences), although most LaserJet printers will still process it correctly (provided that the current selected font is a fixed-pitch font - Courier or LetterGothic).
Chris