I don't understand this syntax:
$linehash{$1}++;
Could you explain it to me?
Absolutely.
This is a common Perl technique, often used with a hash named '%seen' because that's exactly what it's keeping track of. $1 is where you were capturing your names, I just made that the key to the hash and the ++ just increments the value. In long form it's $linehash{$1} = $linehash{$1} + 1. In english that's, "Add one to the value stored in %linehash at $1, replacing the old value." The first time a name is seen it's value will be undef, which conveniently numifies to 0.
Hope that clears it up a little. Good luck with your program.
James
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