Fasta length count format
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4.7 years ago
baurumon ▴ 30

Hi, i have used awk '/^>/{if (l!="") print l; print; l=0; next}{l+=length($0)}END{print l}' seq.fasta to count sequence length. How can i get the output in below format.

Thanks in advance

head length

NC_035897.1:11929374-11930116 742

NC_035897.1:11929384-11930116 732

enter image description here

sequence • 995 views
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Use tr command to change the new line characters to a tab. It is unclear if you want to go in the other direction but if that is the case then switch tab and new lines.

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hi genomax, I want head and length column. tr command is printing one after another. sorry for mistake.

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See RamRS's solution on: Sequence length from Fasta

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i asked my colleague to install seqkit but it going to take time. is there any way to do it with sed or awk?

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It is advisable to search for this sort of problems on Google first before it is posted on this platform, please take a look at Brief Reminder On How To Ask A Good Question.

A simple Google search provided this and it could be the solution you're after - https://www.danielecook.com/generate-fasta-sequence-lengths/

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4.7 years ago
kloetzl ★ 1.1k

This should do it:

awk '/^>/{if (l!="") print l; print; l=0; next}{l+=length($0)}END{print l}' seq.fasta | paste - -
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