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Epsilon User's Manual and Reference
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      keep-duplicate-lines
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   Variable Reference
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      yank-rectangle-to-corner
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keep-matching-lines  Command Reference   kill-all-buffers

Epsilon User's Manual and Reference > Command Reference >

keep-unique-lines

Entirely remove duplicate lines.

This command deletes all copies of any duplicated adjacent lines, leaving only those lines that match neither the preceding nor the following line. If the case-fold variable is nonzero, lines that only differ by case will be considered identical. Also see the uniq and keep-duplicate-lines command.

More info:

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keep-matching-lines  Command Reference   kill-all-buffers


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