perl -le 'print join " ", map {ord pack "H2", $_} shift =~ /../g' 396

##</code><code>##

perl -le 'print unpack "H*", pack "C*", @ARGV' 0011 1001 0110

##</code><code>##

# encode
perl -e 'print sprintf("%04b ",$_) for shift =~ /\d/g' decimal

#decode
perl -e '$p=1; map{$l+=oct("0b$_")*$p;$p*=10} reverse @ARGV; print $l' bcddigit1 bcddigit2 etc