you have 2 options:
1)use the -xml option if you want the info about whats in the file.
2) issue a wipe command when done, open a new file place the data you want in it, open the recorder output file, read the data and append it to the end of the data in newly opened file.
Just as a follow-up, I found the answer to my question on an older post //opensees.berkeley.edu/community/viewtopic.php?t=21354&highlight=remove+recorder&sid=cfaa4c6f495a64ac231d6e61571ec49f. Thanks for your help, though, Frank.