title: Hex to Binary conversion in bash
body: <p>I'm trying to convert a series of bytes from hex to bin using bash.
  but I keep getting (seemingly random) "(standard_in) 1: syntax error" replies from the following code:</p>
  
  <pre><code>for j in c4 97 91 8c 85 87 c4 90 8c 8d 9a 83 81
  do
          BIN=$(echo "obase=2; ibase=16; $j" | bc )
          echo $BIN
  done
  </code></pre>
  
  <p>I did a similar thing with dec to bin, which works perfectly fine:</p>
  
  <pre><code>for i in {0..120}
  do
          KEYBIN=$(echo "obase=2; ibase=10; $i" | bc)
          echo $KEYBIN
  done
  </code></pre>
  
  <p>Does anyone have an idea why it works with decimal, but not with hex?
  In my opinion the syntax is pretty much the same (unless I'm missing something really hard.)</p>