Basic linux and basic linux

Basic linux and basic linux

1. What is linux?

01. Linux is a free-of-charge and freely-spread Unix-like operating system that supports multiple users, multi-tasking, multi-thread and multi-CPU operating systems.
02. Linux can be installed on various computer hardware devices, such as mobile phones, tablets, routers, video game consoles, desktop computers, mainframes, and supercomputers.
03. Lnux has many different Linux versions, but they all use the Linux kernel.

Founder denas towaz was released in October 5!

2. What are the characteristics of linux?

01. Free use, open source code!
02. Basic Ideas:
001. Everything is a file!
002. Each software has a definite purpose!
03. Multi-user and multi-task
Linux supports multiple users. each user has his/her own special rights to his/her file devices, ensuring that each user does not affect each other. Multi-task is one of the most important features of the computer. Linux allows multiple programs to run independently at the same time.
04. Support for multiple platforms
Linux is also an embedded operating system that can run on a handheld computer, a set-top box, or a game machine.

3. What are mainstream linux releases?

01. Hongqi Made in China!

02. The most popular free CentOS!

03. SuSe

04. redHat commercial edition! Yes!

05. ubuntu users

4. What are the advantages and disadvantages of linux?

Advantages:
01. Stable performance
02. High Security and Fast Bug fixing
03. Multi-user and multi-task support
04. Comprehensive user group policies
Disadvantages:
01. unfriendly Gui
02. No specific vendor support

5. What is virtual software?

Virtual software: a system that enables two or more computers to run at the same time! You can simulate a standard PC environment! This environment is exactly the same as the real machine!
Common virtual software:
01. VMare
02. VritualBox (mac)

6. Download The centOS website and the download procedure?

Https://www.centos.org/

7. What are the supporting software in linux?

01. Xshell/SecureCRT

02. XFtp/FileZilla

03. Notepad ++/TextWrangler

8. How does one configure linux network?

01. Configure the network during installation

　　

02. Configure the network after the installation is successful

　　

　　

When the above red box appears, this indicates that the permission is insufficient and you need to replace it with the root user.

IP address assigned by dhclient eth0

If eth0 is not displayed, run ifconfig-a to query all gateway information.

9. linux Configuration

01. View Host Name: hostname

02. ping usage:

001. ping 127.0.0.1

002. ping the local IP Address

003. ping localhost

Ctrl + c: Exit

　　

When the host name cannot be pinged as described above: edit the/etc/hosts file

　　

Configure your host name. Note that you need to add a space with the default configuration!

Ping the host name again to ping the host again!

10. Why do I need to configure the Host Name and IP address ing?

For example, how do we configure the url used to connect to the database ???
Generally, it is an IP address!
If the IP address of our server is changed! So we have to change the address of our project! It's not just a computer problem! Is it very troublesome?
When we connect to the server, we do not need to configure the IP address!
In this case, configure the Host Name and IP address ing!

11. Shutdown and restart?

Reboot: restart any user.

The following command is only available to root users!
Shutdown-r now: Shut down immediately
Shutdown-r 10: 10 minutes later
Shutdown-r: when the time is