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Is there something I can do to a file to cause it to keep the last <= n
records added to it? That is, if n is 10, writing the 11th record would
cause record 1 to be discarded, and the new record would be the 10th
record in the file.

Something like that would be useful in the case of a log file. The file is
helpful for diagnosing recent problems, but you don't want it filling up
the disk, or filling up and being unable to write more records.

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