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[Randal L. Schwartz]

>>>>> "Jos" == Jos Chrispijn <kernel at webrz.net> writes:

Jos> In order to find out if someone logged in, I should then first copy auth.log
Jos> to auth2.log, and do a compare and then do the tail trick. Have to cron that
Jos> every half a minute.

No, just track it with tail -f as was already suggested.

tail -f /var/log/authlog | while read aline; do; ... ; done

The code in the middle will get executed as each line appears in the
file.  This even survives authlog renaming when you logroll.

-- 
Randal L. Schwartz - Stonehenge Consulting Services, Inc. - +1 503 777 0095
<merlyn at stonehenge.com> <URL:http://www.stonehenge.com/merlyn/>
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