Perfect for a shell script: I used bash.

bash
for i in *
do
   (echo $i; cat $i; echo ) > tmp
   mv tmp $i
done

[download]

I'm preseuming newline was supposed to indicate an empty line.

--
TTTATCGGTCGTTATATAGATGTTTGCA

In reply to Re: very basic, just beginning by TomDLux
in thread very basic, just beginning by MiamiGenome

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