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Remove duplicates and keep them in a separate file

 
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# 1  
Old 10-04-2013
Remove duplicates and keep them in a separate file
Hi,

I have a tablular separated file and I want to remove all the rows that have duplicates. The diuplicates I need to check are in column 13.

I have tried to use awk but I have no Idea how to keep the duplicate file.
Code:
awk 'FNR==NR{a[$13]++;next}(a[$13]> 1)' tomodify.txt tomodify.txt > new.txt

but I am not getting the right output.

Can anyone help???
Last edited by Franklin52; 10-04-2013 at 07:43 AM.. Reason: Please use code tags
# 2  
Old 10-04-2013
try

Code:
awk '!A[$13]++' file

# 3  
Old 10-04-2013
Thanks for the reply....

but How can I save both duplicates and unique in two different files? Sorry I put it in the title and forgot to put it in the post
# 4  
Old 10-04-2013
Try
Code:
awk '(! a[$13]++) {print}' tomodify.txt > new.txt

If you want to remove even the first occurance of lines with duplicates:
Code:
awk '{counts[$13]++;lines[$13]=$0} END {for (i in counts) {if (counts[i]==1) {print lines[i]}}}' tomodify.txt > new.txt

EDIT: If you want to keep dupes as well, you could redirect the output inside awk instead:
Code:
awk '{counts[$13]++;lines[$13]=$0} END {for (i in counts) {if  (counts[i]==1) {print lines[i] >> "new.txt"} else {print lines[i] >> "dup.txt"}}}' tomodify.txt

# 5  
Old 10-04-2013
Thank you so so much Smilie

Maybe I am getting lost but ... what if I want to have as output two files, one with the duplicates and one with the uniques?
 
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