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Home/ Questions/Q 8567583
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Editorial Team
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Editorial Team
Asked: June 11, 20262026-06-11T17:54:57+00:00 2026-06-11T17:54:57+00:00

I have a large file in this format: >Abc1 | SOME TEXT atgcgnntcagacagacaa >Abc2

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I have a large file in this format:

>Abc1 | SOME TEXT

atgcgnntcagacagacaa

>Abc2 | SOME DIFFERENT TEXT

nnatgcgatgacatacanggaaga

>Abc3 | SOME OTHER TEXT

gcatgacagagacagatgacaggcacacg

All I am trying to do is change the case of line not starting with ‘>Abc’. Simple it seems but I do not know why it is not working:

sed -n '/^>/! y/atgcn/ATGCN/' sequence.fa > test2

I would appreciate your help.

AK

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  1. Editorial Team
    Editorial Team
    2026-06-11T17:54:58+00:00Added an answer on June 11, 2026 at 5:54 pm

    Remove the -n switch from the command

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