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  1. or download this
    __DATA__
name1   4.5
...
name5   6.5
name4   -7.9
name6   3.2
  2. or download this
    my @order = qw(name1 name2 name3 name4 name5 name6);
map{/(\S+)\s+(-?[\d.]+)/;$a{$1}=$2?$2:'';print "$1 -- $2 \n";}<DATA>;
...
name5   6.5
name4   -7.9
name6   3.2