On 2/12/2013 4:51 PM, Bassem Sossan wrote: > I'm beginner with Linux... > I have found a good resource, it's a book called "Beginning Red Hat Linux > 9"... > the centos's version that I've installed "centos 6"... > Is this book may be compatible with Centos 6 ? not really. Red Hat Linux is ancient. 9 was the short lived final version, in 2003. after RHL 9 came RH Enterprise Linux 2.1, then RHEL 3, then 4, 5, and now RHEL 6, which is rebuilt as CentOS 6. so that book is describing a version of linux that is from 10 years ago, an eternity in computer software evolution. the most basic usermode shell commands will be somewhat the same. -- john r pierce 37N 122W somewhere on the middle of the left coast