Linux Operating System
Linux is a UNIX-like operating system. However, Linux can¡¦t really be called UNIX because it hasn¡¦t been registered to AT&T, the owner of the name of UNIX. The name Linux is after the name of its author, Linus Torvalds. He was a student of University of Helsinki in Finland. Linus modified one of the UNIX¡¦s versions, Minix. In September 1991, he finished his first version of Linux, which was Linux version 0.01. He broadcasted it on the net. In 1992, Linux has already reached version 0.12, which has had a simple shell and C compiler. After that Linux development was very fast because many programmers from all around the world participated in its development. They exchange and broadcast their modified code through the Internet. Many tools were added into Linux operating system such as support for sound cards, CD-ROM drivers, video cards, mouse, network cards, scanners, and so on. But that doesn¡¦t mean that the development of this particular operating system has stopped. Still there are many developers of Linux adding more and more functions into it. Linux is free. Users don¡¦t have to pay for anything because Linux has been licensed under the Free Software Foundation¡¦s General Public License.
¡± http://www.plig.org/xwinman/fvwm.html The brain of Linux is the kernel, the operating system code that governs the whole operating system. The code of kernel is very small but powerful. The kernel sets up a lot of low-level routines and it talks directly to CPU. The way the kernel works is that it translates the user¡¦s command into a set of instructions to the CPU. The kernel sets up a gap between two running programs, which means if one program¡¦s got stuck, the other cannot be affected. ¡± /usr/lib library files for user programs Linux is really a multi-tasking and multi-user operating system. Multi-tasking means it allows several programs to be running at once. It gives each program some CPU time. The more complicated program will be given more CPU time than the simpler one. While multi-user means that multiple users can access the same machine of Linux at the same time. The user of Linux machine can have his machine running and somebody else logging in into his machine through Ethernet connection or modem connection. Each user can run his/her programs in the same CPU and the CPU takes care of all the users at once.
Some topics in this essay:
Security Protection,
System Linux,
Communication Linux,
Linux Linux,
Memory Management,
Window Managers,
System Administrator,
Public License,
Bourne Shell,
Protocol Linux,
operating system,
typing command,
system linux,
hard drive,
linux operating system,
stdout stderr,
linux user,
user type,
window manager,
window system,
his/her system,
essential guide users,
guide users system,
stdin stdout stderr,
companion essential guide,
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Approximate Word count = 2233
Approximate Pages = 9 (250 words per page double spaced)
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