I'd just like to point out that only the first line is of significance for a shebang line. Hence, performing a search-and-replace for lines $. > 1 is not necessary unless... unless you have script-embedded shebangs?!

In reply to Re: Automatically Rewrite Shebang Line on Multiple Files by repellent
in thread Automatically Rewrite Shebang Line on Multiple Files by spickles

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