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sub same_file_p {
  my @stat1 = stat shift;
  my @stat2 = stat shift;
  return "@stat1[0,1]" eq "@stat2[0,1]";
}

sub all_same_file { # true if all arguments represent the same file
  my %counts;
  $counts{join " ", (stat)[0,1]}++ for @_; 
  1 == keys %counts;
}