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Assuming that mesh.k contains only 1 number:

awk 'NR==FNR{num=$1;next} /[0-9]{1,}\.k$/ {sub("[0-9]{1,}\.k$",num".k")} {print}' mesh.k input.k

Please post the required data from "mesh.k" and "input.k".
Also, please edit your post and use code tags. (hurry up, our mods here, are too fast :) )

Frankly I still don't understand exactly what you're trying to do, but if you only want to do the substitution once you could have:

awk 'BEGIN{getline line <"fric.txt"} /mue/{if (done_already)...

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Well, it's very clunky, but you could try:-
echo "31Gddk:r !head -1 file2\n:wq"|vi file1
echo "97Gddk:r !head -1 file2\n:wq"|vi file1

Does that do it? I feel a proper sed or awk would be better...