The docs for hex would point you at sprintf

my $bin = sprintf "%b", hex $hex;

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To go the other direction requires you to do a little work. Perl doesn't come with a binary2decimal (or hex) converter, but you can write your own easily: 
sub bin2dec 
{ 
   my @bits = reverse split '', shift; 
   my $num = 0; 
   for( my $i=0; $#bits >= $i; ++$i )
   { 
      $num += 2 ** $i if $bits[$i] 
   } 
   return $num 
}

my $hex = sprintf "%x", bin2dec( $bin )

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In reply to Re: hex to bin by Adam
in thread hex to bin by Eureka_sg

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