I don't see any syntax error in your for loops, but they might be written in a simpler and less error-prone fashion with something like this: 
for my $i (0..$#sig) {
    for my $j ($i+1..$#sig) {
        print "$sig[$j]\n";
    }
}

[download]
Perhaps it could be made even simpler, but I don't understand well enough what you intend to do to be able to suggest something that might get rid of one of the loops variables.

Update: Another possible way: 

for my $i (0..$#sig) {
    for my $item (@sig[$i+1..$#sig]) {
        print "$item\n";
    }
}

[download]
second update: fixed an off-by-one error in the first piece of code. Thanks to AnomalousMonk for pointing it out.

third update: fixed yet another an off-by-one error . Thanks to AnomalousMonk for pointing it out.

In reply to Re: For loop abortions by Laurent_R
in thread For loop abortions by Sellerzzz

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