$ perl -le'
 use Data::Dumper;
 $Data::Dumper::Useqq = 1;
 print Dumper grep /\s/, map chr, 0 .. 255;
'
$VAR1 = "\t";
$VAR2 = "\n";
$VAR3 = "\f";
$VAR4 = "\r";
$VAR5 = " ";