4.4 Delete duplications of line (uniq)

Format

uniq file-name

If there is the same content as the previous line, the line is not output. You can group consecutive lines of the same content into one line.

Practice: Create a file for the uniq command confirmation

It assumes that there is a file named uniq-sample as follows.

$ cat > uniq-sample ↵ AAA ↵ BBB ↵ AAA ↵ CCC ↵ CCC ↵ DDD ↵ $

Practice: Execution of uniq command

$ uniq uniq-sample ↵ AAA BBB AAA CCC DDD

By executing uniq, duplicates of CCC are organized into one line. There are two rows of AAA, but the result is output as it is. This is because AAA lines are not consecutive, so they were not processed by uniq.