Small History of Linux

Linux Operating system was invented by Linus Torvalds in 1991 when he was a student at university of Helsinki. Linus start this OS development as a very small project and published its source code as the open source to lets the other people around the world to contribute in this OS development. Linux is a Unix Like operating system with Linux Kernel. The Linux kernel is a Monolithic Kernel , the monolithic kernel is the one where the entire operating system is working in the kernel space and alone as Supervisor mode. The monolithic kernel provides the high level virtual interface over the hardware which includes various system calls, process management, memory management etc and hardware device drivers are considered as modules which the kernel then dynamically load these modules at run time. Today various Flavors of Linux are available which are called as Linux Distros (ie Linux Distributions) some very famous amongts them are
1. Red Hat Enterprise Linux
2. CentOs
3. Ubuntu
4. Suse Linux
5. Fedora
6. Gentoo
7. Mandriva
etc. etc.
Well among these all the distributions the two very famous one's are Red Hat Enterprise Linux by Red Hat Inc for Enterprises and Servers and Ubuntu for Desktops. Well I mostly deals with RHEL and Fedora which is the open source project of Red Hat. One thing I want to tell you that if you wants to learn linux as a System Administrator so you must go for Red Hat Enterprise Linux or CentOS which is rebuild version of RHEL. The rebuild version is the one which is exactly same as the RHEL in the whole except the owner logos and Registered Trademarks for the branding and being supported by the external community of enterprise linux and not by the RedHat.