use File::Copy;

mkdir 'WEIGHT' or die $!;
for my $file (glob 'ID_*_weight.txt') {
    copy($file, 'WEIGHT') or die $!;
}

[download]
(untested)

See mkdir, glob and File::Copy.

In reply to Re: new directory with sorted files by choroba
in thread new directory with sorted files by perllearner007

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