Reverse an xxd hexdump
V, 27 bytes
ÎdW40|D
Í üî
Ó../&lt;C-v&gt;&lt;C-v&gt;x&amp;
éiD@&quot;

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Note that &lt;C-v&gt; represents the unprintable character 0x16.
Explanation
This answer is pretty fun because it's about modifying the input into V code and then executing that code. I'll explain each command one at a time
Î                &quot; On every line:
 dW              &quot;   Delete a word
   40|           &quot;   Move to the 40th column
      D          &quot;   Delete everything after this

Í                &quot; Remove all occurrences of
                 &quot; A space 
  üî             &quot; or a newline

Now the buffer looks like this:
1f8b080849202258000370696c6c6f772e74787400d3d707821810d02799c545ba9641a1994c7d60d650d53c44a38a22cd4334aa28d23c44a38a22cd4334aa28d20c00fd512d46b8050000

The command to insert a character by its hex value is
&lt;C-v&gt;x&lt;hex-value&gt;

Here is where we start transforming it into actual V code.
Ó                &quot; Replace
 ..              &quot;   Two characters
   /             &quot;   with
    &lt;C-v&gt;&lt;C-v&gt;x  &quot;   the text &quot;&lt;C-v&gt;x&quot;
               &amp; &quot;   And the two characters we just matched

&lt;C-v&gt;x1fi&lt;C-v&gt;x8bi&lt;C-v&gt;x08i&lt;C-v&gt;x08i&lt;C-v&gt;x49...

But the command has to be in insert mode. So we insert an 'i' at the beginning.
éi               &quot; Insert an 'i'
  D              &quot; Delete this line
   @&quot;            &quot; And evaluate it as V code