while ($line_f1 = <FILE>) {
    while($line_f2 = <FILE2>) {
    # I'm sure the rest you can do it  
    }
    seek(FILE2,0,0);
}

[download]
could be one solution. If it was me however, I would probably read the smaller file into an array or another structure and just go through the other one, instead of reading lines from the second loop as many times as the amount of lines the first one has.

In reply to Re: Loop through 2 files in parallel by AndyZaft
in thread Loop through 2 files in parallel by Anonymous Monk

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