I'd suggest installing the database application (9.2) from scratch and get everything working with an empty database. Then learn what the "data directory" is, find your old one, and replace the "data directory" that was created during the fresh installation with the data directory from the previous installation.
As for the command you ran:
The pg_ctl is apparently not in user "mauro"'s PATH
The -D argument should point to the "data directory", not the pg_ctl executable (how did you even come to write that particular command?)
Usually one does not run the database under a login user account but rather has "postgres" run it. That the executable is under /Users/postgres supports this.
Ideally you'd have an actual back-up and so after you install from scratch you can simply restore the backup into the running database instead of manipulation directories at the O/S level.