Binary printf formats aren't supported in earlier versions. From v5.6.0 perldoc perldelta:
"Binary numbers supported
Binary numbers are now supported as literals, in s?printf formats, and `oct()':
$answer = 0b101010;
printf "The answer is: %b\n", oct("0b101010");"
Update: forgot to put in the meat.
As a string:
$ perl -e '$c = 12;print reverse map {vec $c,$_,1} 0..8*length($c)-1;
+'
0011001000110001
As a number:
$ perl -e '$c = 12;print reverse map {$c&1<<$_?1:0} 0..8;'
000001100
After Compline,
Zaxo
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