Remove duplicate lines without losing the first occurrence
Understand stable first-occurrence deduplication, exact and ignore-case matching, and the checks that prevent silent list damage.
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List cleaning without hidden transformations
Three guides explain stable deduplication, locale-aware natural sorting and whitespace boundaries with reproducible rules.
Natural sorting for lines with words and numbers
See why file2 should come before file10, how locale affects alphabetic comparison and why stable ties still need an explicit rule.
Read articleBlank lines, whitespace-only lines and safe list cleanup
Distinguish empty rows from whitespace-only content and understand why trimming must happen before blank-line removal.
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