fastq.sh – DNA extractor from fastq files

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#!/bin/bash       
                
awk 'NR%4==2' $1 > 90.a       
                
awk 'NR%4==0' $1 > 90.q       
                
cat 90.q | grep -n [\"\'\^\$\#\@\!\%\&\*\(\)\+\] > 90.v       
                
awk 'NR%2==0' $1 > 90.p       
                
cat 90.q | grep  -nv [\"\'\^\$\#\@\!\%\&\*\(\)\+\] > 90.n       
                
cat 90.n | cut -d':' -f1 > 90.m       
                
cat 90.v | cut -d':' -f1 > 90.w       
                
awk 'FNR == NR { h[$1]; next } !(FNR in h)' 90.w 90.a > b.$1