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Strange output from "last" command



My wtmp file seems to have some rather strange entries...

xxxxxx   pts/3        xxx.xxx.xxx.xxx  Wed Mar 21 14:17   still logged in   
date     {                             Wed Mar 21 02:00   still logged in   
date     |                             Wed Mar 21 02:00   still logged in   
xxxx     pts/1        xxx.xxx.xxx.xxx  Wed Mar 21 01:23   still logged in   
xxxx     pts/3        xxx.xxx.xxx.xxx  Wed Mar 21 00:09 - 01:23  (01:13)    
xxx      ftpd23719    xxx.xxx.xxx.xxx  Tue Mar 20 23:25 - 23:35  (00:10)    
xxx      ftpd23714    xxx.xxx.xxx.xxx  Tue Mar 20 23:25 - 23:35  (00:10)    
xxx      ftpd23702    xxx.xxx.xxx.xxx  Tue Mar 20 23:24 - 23:25  (00:01)    
xxxxxx   pts/3        xxx.xxx.xxx.xxx  Tue Mar 20 20:00 - 20:17  (00:17)    
xxxxxx   pts/3        xxx.xxx.xxx.xxx  Tue Mar 20 19:01 - 19:09  (00:07)    

I've replaced the legit usernames and IP's with "xxx" but left them in
for context.  I'm worried that the "date" entries are a consequence of
some hacker activity, but I have been unable to find any other
symptoms.  I did a web search and did not find any mention of this
sort of thing.  I'm using the stable distribution of Debian, with a
2.2.17 kernel.

--Bill.

-- 
William R Ward        hermit@bayview.com      http://www.bayview.com/~hermit/
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"Those are my principles. If you don't like them I have others."-Groucho Marx



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