"Some time ago, I was editing our cron file to remove
core more than a day old. Unfortunately, thru recursing into VI
sessions, I ended up saving an intermediate (wron) version of this
file with an extra '-o' in it.
"The cute thing about this is that it leaves ALL core files
intact, and removes any OTHER file that hasn't been accessed in the
last 24 hours.
"Although the script ran at 4AM, I was the first person to
notice this, in the early afternoon.. I started to get curious when
I noticed that SOME man pages were missing, while others were. Up
till then, I was pleased to see that we finally had some free disk
space. Then I started to notice the pattern."