Lines & ListsLesson 358Free preview
Remove Duplicate Lines
This lesson is part of Web Developer Tools · All levels
Summary
Remove Duplicate Lines removes lines that contain exactly the same content and usually retains the first appearance. Matching can be influenced by spaces, uppercase, and hidden characters. If the order is not important, the sort -u command can be used, but the result will be sorted and not the original order.
Key points
- Duplicates are calculated based on the exact same line content
- The first appearance is generally maintained
- Additional space and differences in capitalization make the line different.
- Sort -u deletes duplicates while sorting data
- Save the output to the new file so the original data does not disappear
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