Lastlog file management

My /var/log/lastlog files are growing like weeds. On one of my systems that's just over one year old the lastlog file is over 1.6GB. yes. Gig.
I don't see any sign in the daily/weekly/monthly scripts that the file is getting rotated. I tried renaming the file, but a subsequent logon just recreated the file AT THE SAME SIZE.
How do I clean up this file (or utmp/wtmp if necessary)?

Hi MacMuse,
I think the size of the lastlog file will be approximately 28bytes*(largest uid of users who have ever logged in).
What is your uid on your Mac? (use the 'id' command if you don't know your uid).
If your uid has a "normal" value (such as 501), then I have no idea why your lastlog file is so large.
If your uid is very large, then it is unavoidable that the lastlog file becomes very large once you login.
On most UNIX/LINUX systems the loatlog file is a "sparse file" and does not take up large disk space even if there is a user with very large uid. But HFS+ on MacOS X does not support the sparse file and so I think your lastlog file is actually using a large disk space.
I tried renaming the file, but a subsequent logon just recreated the file AT THE SAME SIZE.
So your last log file will be "THE SAME SIZE" if it exists and once you login.
But I think the lastlog file will not be automatically re-created if you remane (or remove) it. After you rename the file, please try shutdown and reboot.
PowerMac G4   Mac OS X (10.4.8)  

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