The focus is on usage as opposed to scripting, and it was written in a few days as a somewhat visceral reaction to seeing a single-page introduction to the shell in a coding academy. It may be that the term "booklet" is more appropriate than "book", and it is certainly the case that "wrote" in the context above should not imply "edited" or "published". However, at the moment I am between projects, and I am very happy to take your interest as a spur to complete this work. However, if you had some time to indulge, I might be able to repay your interest somewhat sooner; having other people review one's final copy is probably the next thing to a necessity.
