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Find unique IP address in a list

 
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# 1  
Old 04-11-2011
Find unique IP address in a list
Hello,

I got a list of IP address from which I would like to remove the duplicates. I cat the file and pipe it to uniq -u or uniq -c, I got the same output with all the duplicates. Can anybody please tell me how I can remove the duplicates IPs from this file? This is what I used.
Code:
cat filename | uniq -u
cat filename | uniq -c

Thanks,
Last edited by Franklin52; 04-12-2011 at 03:38 AM.. Reason: Please use code tags
# 2  
Old 04-11-2011
Your question needs example input and example output.

First impression is to sort the data so that "uniq" is presented with data it can process.

"remove the duplicates" is wonderfully ambiguous.

My interpretation is:
Code:
cat filename| sort | uniq -u

Or possibly just:
Code:
cat filename| sort | uniq

Hard to tell without an unambigous example.
# 3  
Old 04-11-2011
Do you have one IP address per line, no other information? Yes? In which case
Code:
sort -u filename

or
Code:
sort -u < filename

will work.

Uniq only works where consecutive lines are identical. If you wish to keep the original order of the file other methods will have to be found.

Andrew
# 4  
Old 04-12-2011
Thanks guys for suggesting using sort . This did the work.

Code:
 
cat filename | sort -rn |uniq -u

 
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