Instruct: Classify Amazon reviews into positive or negative sentiment
Query: A first Reference for Linux

Great work from Mark Sobell... this man is really good! . I'm constantly returning to this book as a reference. It's more recommended for newbies , as it goes through all unix world (concepts,basic commands,shells,etc..) but after you get experienced you'll use it as good reference for some doubts. the main commands are all there with all those -xxxxxx options indeed. I also agree with one of the reviews that said that it needs some new review as it was written is 1997, but it's still a very good value book. Every admin should have one in the shelf.