In case you didn't know: this blog has PDF download button that lets you download any post you like as a PDF document. The formatting is not always 100% perfect, but it's adequate for most needs.
How To Download an Article as PDF
When reading a Unix Tutorial blog post in a desktop browser, check the top right corner above the post. It should have this PDF icon:
Clicking the icon will initiate PDF render of the post – you can either print or save it then:
Unix Tutorial eBooks in PDF
I'll also be publishing my Unix eBooks in multiple PDF editions (print, iPad and mobile phone) soon enough – will share the links as soon as something is ready.