Question 1

Does it preserve the original order?

Accepted Answer

Yes. The first occurrence of each line is kept; subsequent duplicates are removed. The relative order of unique lines is unchanged.

Question 2

What does "trim whitespace" do?

Accepted Answer

When enabled, leading and trailing spaces on each line are ignored when checking for duplicates. So "  hello  " and "hello" are treated as duplicates. The output still contains the original (untrimmed) first occurrence.

Remove Duplicate Lines

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Remove Duplicate Lines

Frequently Asked Questions

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