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Home/ Questions/Q 748371
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Editorial Team
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Editorial Team
Asked: May 14, 20262026-05-14T14:18:47+00:00 2026-05-14T14:18:47+00:00

This question already addresses how to remove duplicate lines, but enforces that the list

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This question already addresses how to remove duplicate lines, but enforces that the list is sorted first.

I would like to perform the remove contiguous duplicate lines step (i.e. uniq) without first sorting them.

Example before:

Foo
Foo
Bar
Bar

Example after:

Foo
Bar
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  1. Editorial Team
    Editorial Team
    2026-05-14T14:18:47+00:00Added an answer on May 14, 2026 at 2:18 pm

    Just found the solution here. The following regex works correctly:

    g/^\(.*\)$\n\1$/d
    
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