Did you know that you can control the name of your controfile trace backups? I didn't, until Bob Morgan of Stonehill College in Easton, MA pointed out some additional syntax in the ALTER DATABASE command.
I already knew that you could control the filename and location when backing up the controlfile in binary, via:
ALTER DATABASE BACKUP CONTROLFILE TO '<pathame>';
And I knew that you could get a text copy of the commands necessary to rebuild the controlfiles, via:
ALTER DATABASE BACKUP CONTROLFILE TO TRACE;
The resulting text commands are placed in the user's trace file for the session. To find the proper trace file requires knowing the session number; it's in the filename. (Though I usually cheat, and go to the directory pointed to by the user_dump_dest parameter, sort by modification time, and my session is near the top.)
What Bob pointed out was the variation:
ALTER DATABASE BACKUP CONTROLFILE TO TRACE AS '<filename>';
This still writes to the backup_dump_dest directory, but names the tracefile with your choice of filename instead of the default one that includes the session number. Much easier to find.