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  1. or download this
    perl -le 'print join " ", map {ord pack "H2", $_} shift =~ /../g' 396
  2. or download this
    perl -le 'print unpack "H*", pack "C*", @ARGV' 0011 1001 0110
  3. or download this
    # encode
perl -e 'print sprintf("%04b ",$_) for shift =~ /\d/g' decimal

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