Shulou(Shulou.com)06/02 Report--

I believe that every programmer is no stranger to linux, whether it is a rookie new to the industry, or a boss with more than ten years of programming experience, all know the position of Linux in the IT industry!

I am a rookie developed by Web JAVA. For rookies who are new to the IT industry, I spend a lot of time learning the JAVA language needed for work. I work during the day and study JAVA more deeply at night, so how do I get in touch with Linux?

Let's start with that project. On October 18, 2017, an impressive day for me, as soon as we arrived at the company, our boss asked our team members to gather for a meeting and told us that the last project was well completed and liked by customers, so he gave us a new project. This project is a new challenge for everyone. We used windows system before. But this time the customer's need is for us to use the Linux system for programming, whether you will or not, I will give you a month, no matter what method you use to learn Linux, you must start working on this project in a month. This is not the first time I have heard the word linux, but it is the first time to know that linux also has its indispensable place in the enterprise.

For a rookie like me, the first question in my mind is: why do you use linux? is there any difference between it and windows? Therefore, knowing what linux is is my first step in starting this project. Asked some IT Daniel and searched some online materials to get a preliminary understanding of linux and some of its features:

1 openness

Openness means that the system follows the world standards and specifications, especially the open systems interconnection (OSI) international standards. All the hardware and software developed in accordance with international standards are compatible with each other and can be easily interconnected.

2 multi-user

Multi-user means that system resources can be owned and used by different users, that is, each user has specific rights to their own resources and does not affect each other.

3 multitasking

Multitasking is one of the most important features of modern computers. It means that the computer executes multiple programs at the same time, and each program runs independently of each other. The Linux system schedules each process to access the microprocessor equally. Because the processing speed of CPU is very fast, as a result, the launched application appears to be running in parallel. In fact, there is only a short delay between the time that the processor executes a set of instructions in an application and the time that Linux schedules the microprocessor to run the program again. 4 device independence

Device independence means that the operating system treats all external devices as files. As long as their drivers are installed, any user can manipulate and use these devices just like using files. Without knowing their specific form of existence.

Linux is a device-independent operating system, and its kernel is highly adaptable. As more programmers join Linux programming, more hardware devices will be added to various Linux kernels and distributions. In addition, because users can get the kernel source code of Linux for free, they can modify the kernel source code to adapt to the new external devices.

5 provides rich network functions

Linux is superior to other operating systems in terms of communication and network functions. Other operating systems do not include the ability to connect to the network so closely integrated with the kernel, nor do they have the flexibility to build these networking features. Linux provides users with perfect and powerful network functions.

7 reliable system security

Linux has taken many security technical measures, including access control of read and write, protected subsystem, audit tracking, core authorization and so on, which provides necessary security for users in the network multi-user environment.

8 good portability

Portability refers to the ability to move an operating system from one platform to another so that it can still run in its own way.

Linux is a portable operating system that can run in any environment and on any platform, from microcomputers to mainframes. Portability provides a means for different computer platforms running Linux to communicate accurately and effectively with any other machine without the need for additional special and expensive communication interfaces.

After listening to this, I was deeply attracted by Linux. From that day on, I began to learn Linux, looking for videos and documents on the Internet, but for me, who did not understand it at all, I could not understand it at all, but one day I accidentally saw on the Internet and said, "this is how to learn Linux." this book is not bad, simple and clear, suitable for Xiaobai, and there are not only books that have already been published. There are also websites for everyone to learn from. I read the book with the mentality of trying, and I really understood it. Moreover, in a short period of half a month, I wrote a shell script and some simple code in Linux. Although they were all basic things, I got started by virtue of my own efforts and Mr. Liu's book. It can be seen that Mr. Liu really wrote the book attentively, because it is only a few simple chapters. I already have a certain understanding of Linux, and it has helped me a lot. At first, I made my confusing code statements clear, and I was able to know why! With further study, I found the difference between windows and linux.

Windows is not open source, that is, you do not know its source code, we cannot or very difficult to create administrator users under windows to manage the company's servers as administrators. If Microsoft wants to do something, it's easy, and it won't be discovered by us.

This is different under Linux, where the source code is open source. You can manage nearly one million servers in the company as an administrator. If the source code is tampered with, it can be easily discovered.

Now many companies have used Linux, you can imagine what kind of position Linux occupies in the IT industry, and it is precisely because of this, I am determined to study Linux harder.

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