Getting Started with Linux

First day

View IP Address:

Use the command on Windows: ipconfig or ipconfig/all

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Commands in Linux:ifconfig or ifconfig-a

Classroom for desktop Sharing.

With VNC, full name: Virtualnetwork Computing (Virtual Network Computing) he is an agreement.

Classroom Desktop Sharing:

A protocol is implemented in n ways.

Using VNC, virtual Network Computing,                                                                                                                                                                                                     

VNC is an agreement , mainly for the network VNC protocol. But its more applications are, including desktop remote control, and read-only sharing.

VNC is also a very important service in the future when it comes to virtualization.

VNC are implemented in a number of ways. (e.g. Tigre)

VNC protocol is a specification that implements this specification in a specific way.

On the CentOS system, we are using TIGERVNC. On Windows using the RealVNC (RealVNC with the C/s architecture, such as we visit the site, the site is the server, we belong to the client, this is the C/s architecture. )

URL Uniform Resource Locator. For example:

URL ftp://172.168.1.1

Some nice PPT document website

Http://www.slideshare.net

von Neumann system:

The five parts of a computer are composed of:

Cpu

Arithmetic, controller , register, Cache

Register: Acceleration part: Memory Ram

The three most important parts of the computer are: arithmetic, controller, memory

Input input device: Next instruction, provide data.

Output Output Device

The von Neumann system also defines the program:

instruction + data or algorithm + structure

For a computer, the CPU is used to run the program. The CPU is also composed of an arithmetic device and a controller.

in memory, is divided into a number of small storage units, we put these each small storage unit, called the cell, the size is fixed, each cell size is 8-bit binary.

Each 8 bits consists of one byte.

bits bit

Bytes bytes

Generally referred to as Big B small B

The smallest storage unit: bytes.

2^10=1024

KB equivalent to a 1024x768

To run a program, the program's instructions and data are stored in memory. Memory is the addressable storage unit.

Pc

Programming Languages:

Sequential execution

Loop execution

Select Execute

CPU run at a higher speed than memory

In order to neutralize the difference between the CPU and memory, the buffer is neutralized.

In the field of acceleration, we use caching to solve, cache as King , which is a very important solution in the field of computer acceleration.

Any two levels between, in the speed, or in logic, as long as not convergence, add the middle layer.

(for example, the CPU is fast, memory is slow, and the cache layer is in the middle)

3GHz Hertz refers to the frequency, time in the data transmission is very important, (for example, every second to print a 1, then a minute is 60 1, if you do not know the time, then we do not know how many of the transmission 1)

Batch Batch processing system:

Multi-tasking:

Multi Tasks

CPU only one, how can you run multiple tasks at once?

We do this to solve, we are on the CPU, by Time Shard, for example, we each 5 seconds in a piece, in the execution of one thing, regardless of finish, just do 5 seconds, then the next 5 seconds we start to execute the second program, and then, in the next 5 seconds, We go back to doing the last unfinished task, so we can implement a single CPU to do multiple tasks at the same time.

GPL general Public License Agreement

Use diff to make patches and patch patches.

Unix It's just a monitoring program that works on hardware.

Monitoring program:

is to drive the hardware resources and then abstract the hardware interface virtual.

Process process. Is the activity unit, each process is called a task. Multiple processes are called multi tasks

The monitoring program is the kernel kernel

The full operating system:

is made up of kernel kernel and application application

operating system OS in the narrow sense :

Only kernel kernel

OS There are two types of interfaces:

GUI Graphical Interface

Gnome (C-language, GTK graphics library)

KDE (c + +, QT graphics library)

CLI Command Line Interface

TUI The text interface.

The desktop is also an application.

Sh:

Csh

Ksh

Zsh

Bash

Tcsh

Using the interface, is in the foreground, do not use the interface is the background.

Features of the operating system:

Driver Program

Safety

Network Functions

File System

Start a program in Linux:

is to enter commands in Linux and then enter.

The operating system hides the hardware interface and provides a concise system interface, which is called the system call.

Programmer, you can call the system interface, or you can call the library interface.

API Application Program Interface: Application Binary Interface

centos:community ENTerprise OS

Download the CentOS Mirror's domestic site:

http ://mirrors.aliyun.com

http ://mirrors.163.com

http ://mirrors.sohu.com

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Getting Started with Linux