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I've had this happen about three times now. Randomly when I log into my server and type "last" I find that there is no information given to me. Is wtmp periodically emptied? Is this something I should be concerned about?

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Run ls -l /var/log/wtmp* and check if old logs were rotated by logrotate. – Marco Baldelli May 9 '13 at 13:27
turns out they were on a schedule to rotate weekly. Thanks, Marco. – Will Harrison May 13 '13 at 7:05

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