In the below example, the uniq command prints all duplicate lines only and discards non-duplicate lines: $ sort file2 | uniq -D The -D option prints repeated lines and discards the non-duplicate lines. In the below example, I’ve used the -c option to cross-check whether the -d option is only printing the repeated lines or not: $ sort file2 | uniq -cdģ Dr.B.R.Ambedkar With -D, -all-repeated option Therefore, line ChhatrapatiShahuMaharaj has been discarded in the below example: $ sort file2 | uniq -d The -d option prints only lines that are repeated. The below example tells us that the first line is repeated three times, the second line one time, and the third line three times: $ sort file2 | uniq -cģ Dr.B.R.Ambedkar With -d, -repeated option The uniq command prints that count as a prefix with the line. This helps us understand the behavior of the uniq command: $ cat file2īelow, in the next example, we’re using the -c option to count the repeated lines. In the next example, we take output from a sort command and pipe it with uniq command. In the example, I have tried the uniq command with the original file, but it only prints the output as it is, much like a cat output. Before using the uniq command with this file, we should sort it. Note that this file is not sorted, and the duplicate lines are not adjacent to each other. Without any optionīelow is a file named file2, which contains some data. Some involve only uniq, and others rely on additional commands.
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] Examplesīelow are a series of examples, beginning with no options. The lines used in the input file for the uniq command can neither exceed 2048 bytes in length (including any newline characters) nor contain null characters. It actually discards the lines which are repeated and prints the first adjacent repeated line, which enables us to view the output properly. In this scenario, the uniq command helps you to print duplicate lines once in the output. How well do you know Linux? Take a quiz and get a badge.Linux system administration skills assessment.A guide to installing applications on Linux.
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