How to find the particular text stored in the file “data.txt” and it occurs only once

Question

The line I seek is stored in the file data.txt and is the only line of text that occurs only once.

How do I go about finding that particular line using linux?

Answer 1

This is a little bit old, but I think you are looking for this...

cat data.txt | sort | uniq -u

This will show the unique values that only occur once in the file. I assume you are familiar with "over the wire" if you are asking?? If so, this is what you are looking for.

Answer 2

sort data.txt | uniq -c | grep 1

you will find only one that accures one time