How to Send the Contents of a Text File to the Clipboard from the Command Line in OS X?
Nevermind, figured it out.
pbcopy < filename
#copies contents of a text, rtf, or eps file to the clipboard
pbpaste
#pastes content of clipboard to stdout
Yep, that's the way to go. Of course, you can also pipe output into it, ie, echo "test" | pbcopy.