There are many days where I get stuck with a command I don’t use too often and don’t follow the’man’ pages. This book gives the main commands, syntaxes and some examples of use. It has been a great help in my steep learning curve and used more than the larger Sys admin book. There are times when it doesn’t have the command or explain it completely, but you have to remind yourself that this book is an essentials only. It isn’t something you can carry around with you or slip into your laptop bag.”]
Source: https://www.amazon.co.uk/exec/obidos/ASIN/0596004494/helpnetsecuri-21