I don't have an OS X at hand, so I'll have to guess... If your authorized_keys really is a directory my guess is you should place the file inside it. Like this: cat ~/.ssh/id_urpo | ssh user@computer 'cat >> ~./ssh/authorized_keys/id_urpo'
MaxOSXs printing system is CUPS. Apple bought the company that created CUPS....
EDIT: *Cough* CUPS is the standards-based, open source printing system developed by Apple Inc. for Mac OS® X and other UNIX®-like operating systems.
CUPS is the standards-based, open source printing system developed by Apple Inc. for Mac OS® X and other UNIX®-like operating systems.