'uniq' - print or omit repeated lines - Video Man Pages

The 'uniq' command is used to print or omit repeated lines of text.

- Display each line once (duplicate lines printed only once):
sort path/to/file | uniq

- Display only unique lines (duplicate lines not printed at all):
sort path/to/file | uniq -u

- Display only duplicate lines (duplicate lines printed only once):
sort path/to/file | uniq -d

- Display only duplicate line and count number of occurrences of each line:
sort path/to/file | uniq -cd

- Compare no more than 5 characters in lines:
sort path/to/file | uniq -w 5

- Avoid comparing the first 5 characters in lines:
sort path/to/file | uniq -s 5

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