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How to extract reads which contain specific sequence from fastq file

Hi, I wanna extract some reads which contain my interest sequence information from fastq file, but these sequence information I interested is in the middle of a read or start of a read. How could I extract these reads?

Thank you!

fastq reads extract

Are you are looking for an exact match of your specific sequence? What have you tried?

What are these sequences, and why not extract them with the grep function?

Use bbduk.sh from BBMap suite in filter mode. User guide here. Add literal=sequence_you_are_looking.

If not only looking for exact matches, you can try seqkit grep: seqkit grep --by-seq --max-mismatch 1 --pattern "ATCGAAG" test.fq

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