Removing rows that contain non-unique column entry


 
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# 1  
Old 11-06-2014
Removing rows that contain non-unique column entry

Background:
I have a file of thousands of potential SSR primers from Batch Primer 3.
I can't use primers that will contain the same sequence ID or sequence as another primer.
I have some basic shell scripting skills, but not enough to handle this.

What you need to know:
I need to remove the entire line(row) if its entry in column 3 or 13 is not unique when compared to the rest of its column. Or, I need to cat all lines that have a unique entry in columns 3 and 13 to a new file.

Note: I can't just remove the duplicate value, I have to remove the whole row after checking a value in that row against the rest of its column.

Example data is attached. Red values are duplicates.

Thank you very very very much!
Removing rows that contain non-unique column entry-example-msat-datapng
# 2  
Old 11-07-2014
Try something like:
Code:
awk -F, 'NR==FNR{A[$3]++; B[$13]++; next} A[$3]==1 && B[$13]==1' infile infile

Note: the input file is specified twice. I have used a comma separator here as field separator, so for that to work you need to use a comma as field separator when you export the spreadsheet.

It is untested since there is no text sample... Please post one.
 
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