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#! /usr/bin/env perl
use strict; use warnings;
die "usage: $0 <dir>" unless @ARGV == 1;
...
    rename $_, "$i/$_" or die "rename $_ $i/$_ failed: $!";
  }
}

#! /usr/bin/env perl
use v6;
use fatal; # or is this default?
...
  mkdir $i;
  rename $_, "$i/$_ for splice @files, 0, 1000;
}