You might mean like this:

open (FILE1, "<tabtext.txt");
open (FILE2, ">ludo.txt");
foreach my $paramKey (@params){
    while(<FILE1>){
        if (/$paramKey.*$/){
            print FILE2, "\n";
    }
}
close(FILE1);
close(FILE2);
[download]

Edit: I put the open/close functions in the right place. So now it doesn't overwrite ludo.txt for every loop.

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