. We need to implement a three preparation software, VM virtual machine, Linux image file centos7, remote client Xshell-6.0.0 125p
links: https://pan.baidu.com/s/1Q5G4BqOu3wE6lVd7S5GcZQ
extraction code: 56pr
VM virtual machine not installed, then please see my previous blog
this is my Baidu cloud disk, which the software is free.
II. Let's look at what centos7 version 
1. Let us look at what is the stable version and the development version 
3. We continue to look at linux systems constitute 
three .Linuxd development history
1, Linux predecessor Unix-like
1968 Nian Multics project
MIT , Bell laboratory, General electric Co. came together to develop Multics project. Due to the late development progress is not very good, MIT and Bell Labs have left the project development, eventually leading to the project ran aground.
1970 (Unix year, timestamp) Unix was born
at that time in the development of Multics project, the lab has developed a members developed a game (travel space: space travel), two laboratories have since left the project development, this leads to developers who can not play the game, and later he proposed to re-re-organization of staff development on the Multics project, also appeared in 1970's Unix. At that time the Unix operating system is the use of assembly language (machine language) development.
1973 rewrite Unix in C language
as assembly language has one of the biggest limitations: For over-reliance on computer hardware. Resulting in poor portability, so the latter using the C language in 1973 and its redevelopment.
1975年 Bell实验室允许大学使用Unix。
1975年，bell实验室允许大学使用Unix操作系统用于教学作用，而不允许用于商业用途。
2、Linux诞生
人物 Linus
Linux的开发作者，Linux之父，李纳斯·托瓦兹。Linux诞生时是荷兰在校大学生。
1991年 0.0.1版本
李纳斯当时学校使用的就是Unix操作系统，然后其对系统的底层代码进行了修改，放到了学校为学生开放的网站上，原先他把文件命名写成了Linus’s Unix，后期网络管理发现之后觉得这个名字不好，自己手动的将名字改成Linux。随后其他同学下载之后发现这个版本还是挺好用的，随后都把自己代码贡献给李纳斯。
1992年 0.0.2版本
1994年 1.0版本
2003年 2.6版本
上述所提及的版本号并不是分支版本，而是指Linux的内核版本。
3、开源文化
Linux是开源的操作系统。所谓开源就是指开放源代码。
人 物 Stallman 斯特曼，开源文化的倡导人。
1983年 GNU计划
1985年 FSF基金会
1990年 Emacs、GCC（c语言的编译器）、程序库
1991年 Stallman去找Linus，商谈让Linux加入其开源计划（GNU计划）
1992年 GNU/Linux
4、Linux系统特点
开放性（开源）、多用户、多任务、良好的用户界面、优异的性能与稳定性
Multi-user multi-tasking:
Single-User: a user log in the computer (the operating system), while only allowing a user logon;
single task: a task that allows the number of users simultaneously operating tasks;
Multi-user: a plurality of users, logged on the computer (the operating system), allowing multiple users to operate simultaneously logged;
multitasking: a plurality of tasks, allowing the user to simultaneously perform multiple tasks operate;
Windows belongs: single-user, multi-tasking.
Linux belongs: multi-user, multi-tasking.
Four .centos7 installation, and with a remote terminal Xshell to use it.
1. Create a virtual machine to install the mirror 
2. We turn to the virtual machine configuration 
3. We choose Chinese 
we installed a desktop or else it only makes you install a kernel 
that we must be open in a network 
administrator password we set up 
our software it is installed, we log off as an administrator with 
us to configure the network 
reboot network to the Internet 
we have to try the Internet can 
we use XSHELL remote client to set CENTOS7
open XSHELL, installation is very simple Next Next on the list, Let's look at the configuration
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