Give more context to the site for initial visitors. Its going to be more obvious to those who visited from HN but not to those who stumbled upon it somehow. A little blurb at the top saying this is a reference site for bash scripting syntax and maybe why you saw the need for such a thing would do ease people into the site a bit.
I hate the popup at the bottom, I will hesitate to use the site again because of that (just like many of us avoid news sites with pesky popups), Its a major turn-off. Probably an unpopular opinion around here, but just maybe make a note at the bottom regarding the privacy stuff unless there are legal reasons not to (I'm not up on all the regulations) If you can't avoid it, make it way less intrusive.
Overall its really nice and I love to see better documentation made around old-school linux/bash tools and syntax as I often feel the documentation can be unwieldy with a lot of knowledge assumed. +1 to examples as others have said. Keep it up! :)