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It'd be nice to know how to test this w/o requiring another active P2P peer. That said, I found 10 characters, simply from syntax. If we didn't mind it being like 30 lines long, we could take advantage of newlines for another 15ish characters.
$p=shift;$a=a(shift);i(shift);socket S,2,1,6;bind S,$a;listen S,5;undef$/;while(@ARGV&&($_="$p $a f".shift)||accept(C,S)&&($_=<C>)&& +close C){m!^(.*?) (.*?) ([e-i])([^/]*)/!s&&$1 eq$p&&&$3($2,$4,$')}sub e{open F,'>',$_[1];print F $_[2];close F}sub f{t($_,@_)for keys%k}sub g{open(F,'<',$_[1])&& t($_[0],$a,"e$_[1]",<F>);close F}sub h{t($_[0],$_,'i')for keys%k}sub i{$k{$_[0]}=1}sub a{$_[0]=~/:/;pack'CxnC4x8',2,$',split'\.',$`}sub t{socket X,2,1,6;$w=shift;if(connect X,a($w)){print X "$p $_[0] $_[1]/$_[2]";close X}else{undef$k{$p}}}

Update: This is what I just submitted back to the author. I think it ends up being 516 characters over 8 lines.

$/=$_;$(=shift;$a=shift;i(shift);socket S,2,1,6;bind S,a($a);listen S,5;while(@ARGV&&($_="$( $a f".shift)||accept(C,S)&&($_=<C>)&&close C){m!^(.*?) (.*?) ([e-i])([^/]*)/!s&&$(eq$1&&&$3($2,$4,$')}sub f{t($_, +@_)for keys%k}sub a{pop=~/:/;pack'CxnC4x8',2,$',split'\.',$`}sub i{$k{$_[0]}= +1}sub g{open(F,"<$_[1]")&& t($_[0],$a,"e$_[1]",<F>);close F}sub h{t($_[0],$_ +,'i')for keys%k}sub t{socket X,2,1,6;if(connect X,a($w=shift)){print X "$( $_[0] $_[1]/$_[2]";close X}else{undef$k{$w}}}sub e{open F,">$_[1]";print F $_[2];close F}

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In reply to Re: P2P Golf: MoleSter by dragonchild
in thread P2P Golf: MoleSter by hossman

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