Minor note:
A typical solution to this kind of problem would be to implement a sliding window
But he is trying to slide:
$START += $BUFF_SIZE - length($FIND);
Unfortunately, it seems that his 4th argument to read is understood as "offset into file", while, of course, it is "offset into buffer". If this
read $F, $BUFFER, $BUFF_SIZE, $START;
is replaced with
seek $F, $START, 0;
read $F, $BUFFER, $BUFF_SIZE;
then his sliding window works.
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