I am trying to track all ops in my channel to see who has been in the channel. this script I wrote writes all the ops into op.txt but it duplicates the ops within the text. What is wrong with this script?

on *:OP:#Mychan: {
var %i = 0
while (%i <= $lines(op.txt)) {
if ($opnick !isin $read(op.txt,%i)) {
write op.txt $opnick
halt
}
else { inc %i 1 }
}
}




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