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find /your_directory -mtime +7 -exec rm -f {} \;

should help you to delete files.. you can simply use "cron" to execute the above command on particular day.

Plzzz How does the number of files...

Why don't you try using find command to delete files of particular days/weeks old .. like all files older then 7 ...

then use unix "du / df " commands to checks if its usage = 90% .. if so delete...