I have large 3-column files (~10,000 lines) and I would like to remove lines when the contents of the third column of that line appear in the third column of another line. The files' sizes make sort a bit cumbersome, and I can't use something like the below code because the entire lines aren't identical; just the contents of column 3.awk '!seen[$0]++' filename
Remove lines based on duplicates within one column without sort
text processing;awk