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Top Forums UNIX for Dummies Questions & Answers Find & Replace command - Fasta file Post 302580242 by Cevin21 on Thursday 8th of December 2011 02:35:18 AM
Old 12-08-2011
Find & Replace command - Fasta file

Hi all !

I have a fasta file that looks like that:

>Sequence1
RTYIPLCASQHKLCPITFLAVK

(it's just an example, obviously in reality I have several pairs of lines like that)

Using UNIX command(s), would it be possible to replace all the characters except the "C" of the second line only by a dash. So without modifying the first line.
To be able to obtain this:

>Sequence1
------C------C--------

Or at least which command would you use? (grep, awk, perl, sed...)

Thank you very much for your help !!!
Cevin21
 

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