I have been trying to change the ownership of a (test) file in two ways . 1) Through finder (get info - sharing and permissions - unlock preferences - clicking + to add a new owner (which had previously been created in the system preferences-accounts) selecting the new owner, clicking the gear icon and choosing "make (username of new owner) the owner. 2) Using terminal : terminal command chown [username] [file ]. In the latter case I get the error "no such file or directory" (although I certainly typed the correct (test) file name. Using the first procedure, attempts to change the ownership have also failed because to unlock the (test) file I still need to type the administrator password and not the password of the new owner. Has anyone useful ideas on what went wrong in both cases ? I use an Intel iMac running Mac OS 10.6.8. Thanks.