Some time ago I asked you if you would be interested in a book about Erlang performance. [1]<p>There were many people interested, but the publishers I talked to were not interested. So I wrote a book about designing Command Line Interfaces and writing Command Line Clients instead and published it on my own (<a href="http:&#x2F;&#x2F;theclibook.com" rel="nofollow">http:&#x2F;&#x2F;theclibook.com</a>)<p>As I still have material from the draft I sent out to the publishers I decided to publish the content on my blog. I hope you enjoy!<p>Robert :)<p>[1] <a href="https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10047444" rel="nofollow">https:&#x2F;&#x2F;news.ycombinator.com&#x2F;item?id=10047444</a>