Remove lines with unique information in indicated columns


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# 1  
Remove lines with unique information in indicated columns

Hi, I have the 3-column, tab-separated following data:

Code:
dot is-big 2 
dot is-round 3 
dot is-gray 4 
cat is-big 3 
hot in-summer 5

I want to remove all of those lines in which the values of Columns 1 and 2 are identical. In this way, the results would be as follows:

Code:
dot is-big 2 
cat is-big 3

Is there an awk / grep that code easily help me to solve this problem. My issue is isolating Cols. 1 and 2 and not considering the information in Col. 3 when trying to remove the unique lines.

Thanks!
# 2  
Can you please explain more...because, from the data you shown above, how do you get the result you provided for identical cols 1 & 2.
Anyways, if you want unique col 1 & 2
Code:
awk '! a[$1 $2]++' <inputfile>

This User Gave Thanks to SriniShoo For This Post:
# 3  
Thank you for your response.

Quote:
Originally Posted by SriniShoo
Can you please explain more...because, from the data you shown above, how do you get the result you provided for identical cols 1 & 2.
Anyways, if you want unique col 1 & 2
Code:
awk '! a[$1 $2]++' <inputfile>

I think maybe I did not describe well my problem. I don't want unique Cols1 and 2. I need to remove all unique Col 2. (regardless of what is in Col 1.), In the example I provided, you can see that the Col 2 that remains are duplicates while the Col 2 that were unique are discarded.

Last edited by owwow14; 03-02-2014 at 04:31 PM..
# 4  
Code:
awk '
NR==FNR {cnt[$2]++; next}
cnt[$2]>1
' infile infile

# 5  
Code:
awk '$2 in A{print A[$2] $0; A[$2]=x; next} {A[$2]=$0 ORS}' file


Last edited by Scrutinizer; 03-02-2014 at 06:00 PM..
This User Gave Thanks to Scrutinizer For This Post:
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