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Operating System

Securing and Optimizing Linux: RedHat Edition.pdf

August 28, 2010 · Filed Under Operating System · Comment  · Tags: , , , ,

Taken from Some good reasons to use Linux: There are no royalty or licensing fees for using Linux, and the source code can be modified to fit your needs. The results can be sold for profit, but original authors retain copyright and you must provide the source to your modifications.
Because it comes with source code to the kernel, it is quite portable. Linux runs on more CPUs and platforms than any other computer operating system.
The recent direction of the software and hardware industry is to push consumers to purchase faster computers with more system memory and hard drive storage. Linux systems are not affected by those industries’ orientation because of it capacity to run on any kind of computers, even aging x486-based computers with limited amounts of RAM.
Linux is a true multi-tasking operating system similar to his brother UNIX. It uses sophisticated, state-of-the-art memory management to control all system processes. That means that if a program crashes you can kill it and continue working with confidence.
Another benefit is that Linux is practically immunized against all kinds of viruses that we find in other operating systems. To date we have found only two viruses that were effective on Linux systems.

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Linux Administration Made Easy.pdf

August 21, 2010 · Filed Under Operating System · Comment  · Tags: , ,

Taken from What is Linux?: Linux is a true 32?bit operating system that runs on a variety of different platforms, including Intel, Sparc, Alpha, and Power?PC (on some of these platforms, such as Alpha, Linux is actually 64?bit). There are other ports available as well, but I do not have any experience with them.
Linux was first developed back in the early 1990s, by a young Finnish then?university student named Linus Torvalds. Linus had a “state?of?the?art” 386 box at home and decided to write an alternative to the 286?based Minix system (a small unix?like implementation primarily used in operating systems classes), to take advantage of the extra instruction set available on the then?new chip, and began to write a small bare?bones kernel.
Eventually he announced his little project in the USENET group comp.os.minix, asking for interested parties to take a look and perhaps contribute to the project. The results have been phenomenal!
The interesting thing about Linux is, it is completely free! Linus decided to adopt the GNU Copyleft license of the Free Software Foundation, which means that the code is protected by a copyright ?? but protected in that it must always be available to others.

Pocket Linux Guide.pdf

August 5, 2010 · Filed Under Operating System · Comment  · Tags: ,

This guide is intended for intermediate to advanced Linux users. It is not intentionally obscure, but certain assumptions about the readers skill level are made. Success with this guide depends in part on being able to perform the following tasks:
Use basic shell commands
Reference man and info pages
Build a custom Linux kernel
Compile source code using make and related tools

EVMS (Enterprise Volume Management System) User Guide.pdf

July 30, 2010 · Filed Under Operating System · Comment  · Tags: , , ,

Taken from What is EVMS?: EVMS brings a new model of volume management to Linux. EVMS integrates all aspects of volume management, such as disk partitioning, Linux logical volume manager (LVM) and multi?disk (MD) management, and file system operations into a single cohesive package. With EVMS, various volume management technologies are accessible through one interface, and new technologies can be added as plug?ins as they are developed.

The Linux System Administrator’s Guide.pdf

July 22, 2010 · Filed Under Operating System · Comment  · Tags: , , ,

Taken from Various Parts of Operating System: Various parts of an operating system: UNIX and ‘UNIX?like’ operating systems (such as Linux) consist of a kernel and some system programs. There are also some application programs for doing work. The kernel is the heart of the operating system. In fact, it is often mistakenly considered to be the operating system itself, but it is not. An operating system provides provides many more services than a plain kernel.
It keeps track of files on the disk, starts programs and runs them concurrently, assigns memory and other resources to various processes, receives packets from and sends packets to the network, and so on. The kernel does very little by itself, but it provides tools with which all services can be built. It also prevents anyone from accessing the hardware directly, forcing everyone to use the tools it provides. This way the kernel provides some protection for users from each other. The tools provided by the kernel are used via system calls. See manual page section 2 for more information on these.
The system programs use the tools provided by the kernel to implement the various services required from an operating system. System programs, and all other programs, run `on top of the kernel’, in what is called the user mode. The difference between system and application programs is one of intent: applications are intended for getting useful things done (or for playing, if it happens to be a game), whereas system programs are needed to get the system working. A word processor is an application; mount is a system program. The difference is often somewhat blurry, however, and is important only to compulsive categorizers.
An operating system can also contain compilers and their corresponding libraries (GCC and the C library in particular under Linux), although not all programming languages need be part of the operating system.
Documentation, and sometimes even games, can also be part of it. Traditionally, the operating system has been defined by the contents of the installation tape or disks; with Linux it is not as clear since it is spread all over the FTP sites of the world.

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