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- An in-depth interpretation of the plus sign and dot in the permission column in Linux
- 1. Overview In Linux, the ls-l command is the most commonly used. The first column in the command display result is also where we are more concerned. Generally speaking, the characters indicating permissions occupy 10 positions. However, we often see content displayed at the eleventh position in this column. The most common one is the dot (.), and the plus sign (+) will also appear in this position. What is this? What's going on? Let's try it out with our own hands, shall we? 2. Regarding the dot (.) in the permission column 2.1 Let us take a look at the root directory. [root@DCGH~]#ls-lZ/lrwxrwxrwx.rootrootsystem_u:object_r:bin_t:s0bin->
- LINUX 1091 2024-07-02 16:51:22
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- linux affairs Yongzhen Technology: the world's leading supplier of green energy structural materials and application solutions
- Yongzhen Technology (Suzhou) Co., Ltd. Yongzhen Technology Co., Ltd. was established in 2009 and is headquartered in Chengdu, Sichuan Province, China. It specializes in the development, production, sales and application of red energy structural materials. The company has successively set up production bases and branches in Chengde, Sichuan, Xuzhou, Jiangsu, Bozhou, Anhui, Vietnam and Singapore. The business scope includes photovoltaic aluminum alloy frames, Carbonado luxury rooftop photovoltaic systems, building integrated photovoltaic products (BIPV), photovoltaic brackets and other products and related solutions. Among them, the production capacity of the five bases of photovoltaic aluminum alloy frame products has been released to approximately 130GW. /year, is the world's leading supplier of red energy structural materials and application solutions. The company was selected as a high-tech enterprise, a specialized and new small giant enterprise, and a citizen of Jiangsu Province.
- LINUX 841 2024-07-02 07:31:53
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- How to configure security groups for cloud hosts in batches in Python?
- The biggest change for operation and maintenance personnel in recent years may be the emergence of the public cloud. I believe that many small partners may run their business on the public cloud. Because of the company's business relationship, I personally came into contact with the public cloud very early, probably I started using Amazon Cloud around 2012, and later gradually came into contact with domestic Alibaba, Tencent Cloud, etc. As the company's business developed domestically, we have also used many domestic public cloud vendors in the past few years, so in terms of cloud operation and maintenance I have also accumulated some experience, from traditional physical machines to public cloud operation and maintenance. I personally think that the biggest question is whether you can think in terms of public cloud to achieve a safe, stable, scalable and economical business architecture. Cloud operation and maintenance is different from traditional operation and maintenance. For example, anyone who understands public cloud knows the concept of security group.
- LINUX 453 2024-07-02 03:16:31
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- Tips for using Cream to make Vim more user-friendly
- The Cream add-on package makes it easier to use by putting a more familiar "face" on top of the Vim text editor while retaining Vim's functionality. When I introduced Cream to them, their disappointment turned into satisfaction. Cream is an add-on package for Vim that makes Vim easier to use. Cream turns these Linux novices into strong advocates and loyal users of Vim. Let's take a look at what Cream is and how it makes Vim easier to use. Cream installation Before installing Cream, you need to install the GUI components of Vim and GVim on your computer. The easiest way I've found to accomplish this is to use the Linux version
- LINUX 644 2024-07-01 14:46:07
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- MySQL optimization parameters reference!
- Preface When it comes to tuning in daily MySQL operation and maintenance, the MySQL configuration file my.cnf cannot be ignored. The default parameters of MySQL cannot meet the needs of our daily online business, so optimizing parameters is also an indispensable link. I don’t want to list how many items there are in the my.cnf configuration and the meaning of each item. These can be found in the official documentation. The following only describes some parameters that should be paid attention to in daily work. Some parameters are explained below. There are of course other settings that may come into play, depending on your load or hardware: you will need special tuning in situations with slow memory and fast disk, high concurrency and write-intensive workloads. However the goal here is to get you to a robust MySQL quickly
- LINUX 1146 2024-07-01 07:51:19
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- How to use Kinect 2.0 RGB-D sensor for complex tasks in Ubuntu 16.04?
- In the previous articles, I explained how to configure the OpenCV3.4.1kinectforlinux driver in Ubuntu16.04, and completed the learning of its basic knowledge based on some OpenCV tutorials. However, during the learning process, the images used for experiments were large. Some of them come from the Internet or rely on the camera of a computer laptop. In order to complete some more complex tasks, other visual sensors need to be used, so here is a record of Ubuntu16.04 using Kinect2.0RGB-D sensor. . 1. Driver installation Kinect 2.0 has officially provided ready-made drivers in Windows systems, but there are corresponding SDKs that can assist.
- LINUX 1112 2024-07-01 06:12:56
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- android linux kernel layer Android cross-process communication: introduction to IPC, Binder and ServiceManager
- Author's summit account: Windy_llebpf's application in Android security: Combining binder to complete a behavior inspection sandbox (Part 1) 1. Brief introduction to IPC IPC is the abbreviation of Inter-Process Communication, which means inter-process communication or cross-process communication. The process of exchanging data between two processes. When does Android need cross-process communication? When Android requests system services, there will be a need for cross-process communication, such as accessing mobile phone address books, obtaining location, etc. The goal of this article is to implement a simple sandbox to capture this behavior. 2. Binder A brief introduction to Binder It's Andro
- LINUX 917 2024-06-30 16:27:04
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- Telnet protocol: the standard protocol and main method of remote login service
- Use telnet to test the connectivity of Linux/Windows ports. The telnet contract is a member of the TCP/IP contract family and is the standard contract and main form of Internet remote login service. It provides users with the ability to complete remote host work on their local computer. Use the telnet program linuxtelnet port on the end user's laptop and use it to connect to the server. End users can enter commands into the telnet program, which will run the linuxtelnet port on the server as if they were entered directly on the server's console. Therefore, the port connectivity can be tested through telnet. Test whether the port under the Linux system is
- LINUX 1156 2024-06-30 10:39:29
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- Explore the concept, implementation and management of KSM in the Linux 2.6.32 kernel
- Introduction: As a system manager (hypervisor), Linux® has several innovations. An interesting change in the 2.6.32 kernel is that KSM (KernelSamepageMerging) allows the system manager to reduce the number of concurrent virtual machines by merging memory pages. This article explores the concepts behind KSM (such as storage decoupling), the implementation of KSM, and how to manage KSM. Server virtualization Virtualization technology began to appear in the 1960s and became popular through the IBM® System/360® minicomputer. Fifty years later, virtualization technology has developed by leaps and bounds, making it possible for multiple operating systems and applications to share a server. this special purpose
- LINUX 422 2024-06-30 09:12:23
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- Take you to understand the basics of MTA in a quarter of an hour
- Overview In this tutorial, you will learn: Using the mail command. Create a mail alias. Configure email forwarding. Understand common mail transfer agents (MTAs), such as postfix, sendmail, qmail, and exim. Controlling where your emails go Email on Linux systems is delivered using the MTA. Your MTA delivers mail to other users on your system, and MTAs communicate with each other across systems for delivery around the world. Sendmail is the oldest LinuxMTA. It originally originated as the delivermail program for the ARPANET in 1979. There are several alternatives to it today, and in this tutorial I'll cover them as well. The prerequisite is to complete this
- LINUX 1175 2024-06-29 17:24:03
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- How an IT person can become a cloud computing engineer
- Before people understand how to become a cloud computing engineer, they first need to understand what cloud computing is. Cloud computing is a scalable method of providing computing-related resources over the Internet. The engineering discipline applied to this concept is called cloud computing engineering, which is associated with any technology related to cloud computing. Cloud computing builds a systematic approach that focuses on the standardization and governance of cloud computing applications. Cloud computing engineers mainly focus on a few key cloud services: Infrastructure as a Service Platform as a Service Software as a Service Cloud computing engineers are IT professionals who are responsible for any technical issues related to cloud computing. Their responsibilities include support, maintenance, design, management, and planning. Multiple job positions focused on different types of computing are related to Cloud Computing Engineer: Cloud Computing Security
- LINUX 1292 2024-06-29 14:35:22
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- Linux File Systems: Characteristics of File Names, Case, Extensions, and File Types
- On Linux, any software and I/O devices are regarded as files and the file name in Linux supports a maximum of 256 characters, which can be named with A~Z, a~z, 0~9 and other characters. Unlike Windows, file names in Linux are case-sensitive, and all UNIX series directories follow this rule. There is no concept of c drive (such as C drive, D drive) under Linux, but only directories. Different hard disks are mounted in different directories. It is reported that Linux files do not have extensions, so the file name under Linux has nothing to do with its type. For example, abc.exe can be a text file, and abc.txt can also be an executable file. Text under Linux
- LINUX 506 2024-06-29 06:19:42
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- Learn Bash skills in the game
- Whether you're a newbie or a veteran, there are always fun ways to test your BASH skills. In this tutorial, I'll explain how to test your BASH skills by playing a command line game. In fact, technically speaking, these are not real games like SuperTuxKart, Need for Speed or Counter-Strike. These are just gamified versions of Linux command training courses. You will need to complete a mission based on certain instructions from the game itself. Now, let’s take a look at a few games that can help you learn and practice Linux commands in real time. These games are not just time-killers or mind-blowing, these games will help you get a real experience with terminal commands. Read on: Test your BASH skills with ‘Wargames’ Here’s
- LINUX 643 2024-06-29 02:15:10
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- A brief analysis of the installation of Opencv 2.4.13 version under Linux
- 1. Download and then unzip and install the compressed package unzipopencv-2.4.13.zip2. Enter the folder you just decompressed and create the release folder cdopencv-2.4.13mkdirrelease3. Install the necessary dependency libraries sudoapt-getinstallbuild-essentialcmakelibgtk2.0-devpkg-configpython -devpython-numpylibavcodec-devlibavformat-devlibswscale-dev4. Enter the release folder and compile Ope with cmake
- LINUX 818 2024-06-28 16:17:40
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- In-depth analysis of the kernel source tree: the synergy between Kconfig files and Makefiles
- Principle Each directory in the kernel source tree also contains a Kconfig file, which is used to describe the kernel configuration menu related to the source code in the directory. The Kconfig files in each directory constitute a distributed kernel configuration database. When configuring the kernel through the makemenuconfig command, the menu storage technology principle analysis is read from the Kconfig file: Based on the linux26 kernel source code, the configuration is saved to a kernel configuration file named .config for use by the Makefile when compiling the kernel. The Makefile at the top of the source code directory tree is the entrance to the entire kernel source code management and plays a decisive role in the source code compilation of the entire kernel. When compiling the kernel linuxc, top
- LINUX 1246 2024-06-28 08:18:52
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