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hi steven,

On Tue, Jan 22, 2002 at 08:20:53PM -0500, Steven M. Bellovin wrote:
> How far back do you need login records?  You might want to add some=20
> code to /etc/daily.local to rename /var/log/wtmp daily instead of=20
> weekly, in which case 'last' would give you what you want.

there is a tool called newsyslog(8) for this purpose.
it is executed from root's crontab every hour by default.

  # crontab -l
  [...]
  #rotate log files every hour, if necessary
  0       *       *       *       *       /usr/bin/newsyslog
  [...]

you can easily setup it to rotate your wtmp daily, without compression
(as greg said already).

regards,

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