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Hello,

Following may help you.


awk 'NR==FNR{a[$2]=$0;next} ($0 in a){print a[$0]}' fileB fileA


Ouptut will be as follows.


NODE_0 fig|562.2322.peg.1 peg
NODE_0 ...

for file in /source_dir/*.fasta
do
fname="${file##*/}"
awk '/>/{sub(">","&"FILENAME"_");sub(/\.fasta/,x)}1' "$file" > /dest_dir/$fname"
done

awk '/>/{sub(">","&"FILENAME"_");sub(/\.fasta/,x)}1' sample_1.fasta