Bandit Level 8-9
We have to find the only unique entry. To do this we can use a command "uniq". Using the flag -u, it will print out only the unique answers.
uniq -u data.txt
output: a wall of text.
Well... it turns out that if you have read the manual (man uniq) you would have known that the data has to be sorted first. We can sort it using sort. I know, shocker.
sort data.txt | uniq -u