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binmode $fh;
read($fh, my $buf, 20000);

binmode $fh;
local $/ = \20000;
my $buf = <$fh>;

binmode $fh;
my $file = '';
1 while read($fh, $file, 8*1024, length($file));

binmode $fh;
local $/;
my $file = <$fh>;