Try this:

print $fh chr 4;
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Note, not tested, but I lifted the ASCII code for ^d from here: http://www.cs.tut.fi/~jkorpela/chars/c0.html. HTH. Also assumes you want to print to a filehandle $fh. If your filehandle is named differently, adjust to suit.

s**lil*;  $*=join'',sort split q**;  s;.*;grr; &&s+(.(.)).+$2$1+; $; =
qq-$_-;s,.*,ahc,;$,.=chop for split q,,,reverse;print for($,,$;,$*,$/)
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