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< Back to article list AWK: Removing duplicates in a file without sorting it March 20, 2023 I found this one-liner today on commandlinefu. Not something you do every day, and I’m not sure awk is worth investing into, but it’s quite handy anyway: ➜ ~ cat data.txt d a b d b c ➜ ~ awk '!x[$0]++' data.txt d a b c