How to filter for evalue threshold in blastx output
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Entering edit mode
2.7 years ago

I used blastx to search DNA fasta files for proteins that I compiled to a costum database using makeblastdb -dbtype prot. The blastx command I used is as follows:

blastx -query sample1.fasta -db costum_DB -out result_sample1.tsv -outfmt "6 qseqid sseqid pident length mismatch gapopen qstart qend sstart send evalue bitscore" -num_threads 12

Then I used the following command to print the number of hits of each protein in my input fasta file.

cut -f2 result_sample1.tsv | sort | uniq -c > summy_of_hits_sample1.tsv

My question is: how can I filter or print only hits with a minimum e-value? The maximum e-value given now is 10 and I want to only count hits where the e-value is 0.01. Since the e-value is present in column 11, I guess there might be a possibility to filter?

bash blastx • 876 views
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Entering edit mode
2.7 years ago
Buffo ★ 2.4k
-evalue 0.01 

and

-outfmt 6

The std output for format 6 is the same you specified, no need to specify it twice

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