Linux system has penetrated into every corner of IT field. As an IT practitioner, no matter you are focused on programming or operation and maintenance, you should have some understanding of Linux, and even need to study deeply to master the core principles.
Linux learning advice: Be sure to install Linux, learn on a real Linux system, if possible, it is best to install on a physical machine.
Linux Basics
The basics seem simple, but it takes a lot of work to really understand them. In addition to the accumulation of experience, they need to be constantly thinking and understanding, so that they can write reliable programs
File I/O
File I/O is an integral part of the operating system and a means of data persistence. For Linux, the idea of “everything is a file” highlights the important position of files in the Linux kernel
Standard I/O library
We’ll start with the standard I/O library, which is indispensable to programming in the Linux environment. While studying and analyzing standard I/O libraries, you can gain a better understanding of both by comparing them with Linux I/O system calls
Process environment
In a Linux environment, each process has a separate process space so that different processes are isolated from each other so that they do not affect each other. A deeper understanding of the process environment in Linux can help you write more robust code
Process control: The life of a process
Process is a core concept of operating system. Each process has its own unique identifier, the process ID, and its own life cycle
Process control: state, scheduling, and priority
Linux is a multi-user, multi-task operating system. There may be multiple processes running at the same time, and the number of processes may be far more than the number of cpus. It is unfair for one process to occupy CPU resources all the time. The process scheduler selects the right process to use CPU resources at the right time
signal
A signal is a software interrupt used to handle asynchronous events. The essence of signaling is communication between processes, one process sends signals to another process, and the kernel at least passes the field of signal value.
Understanding Linux threads
To make your code run faster, simply relying on faster hardware is no longer enough. Programmers need to write concurrent code to fully exploit the power of multi-core processors and improve the performance of their programs.
Interprocess communication: pipes
In Linux, multiple processes are sometimes required to work together to complete a task. Sometimes messages need to be passed between processes or threads, and sometimes synchronization is needed to coordinate their work.
Interprocess communication: System V IPC
The three IPC mechanisms are quite different, and an important reason for discussing them together is that they were developed together
Interprocess communication: POSIX IPC
POSIX IPC appeared later than SystemV IPC, so POSIX IPC designers can leisurely reference SystemV IPC, absorb its design strengths, avoid its design weaknesses. POSIX IPC is superior to SystemV IPC in general because of its late-mover advantage
Network communication: establishment of connections
In the Internet era, network communication programming has become one of the essential skills of a programmer. Almost all products involve network operations or access. In Linux programming environment, the system provides the socket to provide unified network programming interface for programmers
Network communication: sending of data packets
Study the packet sending process from the application layer to the kernel
Network communication: Receiving data packets
Learn how packets are received, and also start at the application layer, then dive into the kernel implementation code to really understand the interface to receive data
Write safe-error-free code
Here’s a look at some of the coding details, starting with the basics, that can seem a bit scattershot and a bit tricky
Total directory
The last
Linux has become a must-have skill for developers today, and its advantages are:
- Linux doesn’t have to choose whether to put the software on drive C or drive D, it already defines which files go where,
- You don’t need anti-virus software,
- You don’t have to clean up your trash,
- I don’t need to free up memory,
- You don’t need to activate the system, it’s open source and free,
- There is no need for disk optimization,
- No annoying popovers,
- There are no mandatory updates.
If you’re ready to learn more about Linux, check out this study guide, which will help you in some ways.
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