User Management

Comprehensive Analysis of Linux System Permissions

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Comprehensive Analysis of Linux System Permissions

Author: Stubborn Stone_ https://blog.csdn.net/2302_78391795/article/details/148368911 Introduction This article starts from the <span>essential concept of permissions</span> and gradually dissects core elements such as <span>user roles, file permission identifiers, and permission operation commands in the Linux system</span>. It not only deeply analyzes the underlying logic of basic commands like chmod and chown but also <span>reveals the special rules … Read more

Detailed Explanation of Special Permissions in Linux Files (Part 2): SUID and Its Application Scenarios and Usage

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Detailed Explanation of Special Permissions in Linux Files (Part 2): SUID and Its Application Scenarios and Usage

The previous article introduced special permissions for files in Linux, including SUID, SGID, and Sticky Bit. Today, this article will provide a detailed explanation of SUID and its practical application scenarios and usage. What is SUID? Let’s continue with the example from the previous article about a regular user changing their own password. We all … Read more

Linux System Security and Applications: Is It Just Simple “Firewall Configuration”?

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Linux System Security and Applications: Is It Just Simple "Firewall Configuration"?

1. Account Security Control 1. Basic Measures 1) System Account Cleanup Set the shell of non-login users to /sbin/nologin Lock accounts that have not been used for a long time Delete unnecessary accounts Lock account files passwd, shadow 2) Password Security Control Set password expiration: chage -M 30 username Require users to change their password … Read more

The Dark Side of Linux Permissions: Why Root Abuse Can Lead to Disaster?

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The Dark Side of Linux Permissions: Why Root Abuse Can Lead to Disaster?

Click the blue “Most Coders” to follow me! Add a “Star“, every day at 18:03 to learn technology together Linux Permissions (A Comprehensive Understanding of Linux Permissions) • 1. Two Types of Users in Linux • • Super User (root) and Regular User • su Command • sudo Command • 2. Linux Permission Management • … Read more

Tutorial for Setting Up an FTP Server on CentOS 7

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Tutorial for Setting Up an FTP Server on CentOS 7

To set up an FTP server on CentOS 7, it is recommended to use vsftpd. Below are the detailed steps: Step 1: Install vsftpd sudo yum install vsftpd -y Step 2: Start the service and set it to start on boot sudo systemctl start vsftpd sudo systemctl enable vsftpd Step 3: Configure the firewall # … Read more

Top 50 Common Linux Commands (Essential for Operations) Part 2

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Top 50 Common Linux Commands (Essential for Operations) Part 2

This article compiles the top 50 questions frequently encountered in Linux system operation and maintenance interviews. Whether you are a beginner entering the IT industry or an experienced operations personnel aiming for promotion, these questions will provide you with comprehensive knowledge review and practical simulation, helping you stand out in interviews, successfully secure your desired … Read more

Understanding the Differences Between Linux Commands ‘su’ and ‘sudo’

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Understanding the Differences Between Linux Commands 'su' and 'sudo'

Understanding the Differences Between Linux Commands ‘su’ and ‘sudo’ Previously, I was confused about the two commands su and sudo. Recently, I specifically searched for information on this topic and finally clarified the relationship and usage of both commands. This article aims to systematically summarize the findings. 1 Preparation Since this blog involves user switching, … Read more

12 Methods to Find User Account Information and Login Details in Linux

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12 Methods to Find User Account Information and Login Details in Linux

This article introduces practical methods for querying user information in Linux systems, focusing on command-line tools for obtaining user account details, login information, and user activity status. To create a new user, you can use the <span>useradd</span> command; to modify existing user attributes, you need to call the <span>usermod</span> command via the command line. The … Read more

Smart Lock PCBA: Fingerprint Unlocking, Alarm, and Interaction

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Smart Lock PCBA: Fingerprint Unlocking, Alarm, and Interaction

Case IntroductionSmart Lock PCBAFunction Introduction1. Multiple Unlocking Methods Fingerprint Unlocking: Achieves fast and high-precision fingerprint recognition through capacitive or semiconductor fingerprint sensors, supporting 360° pressure from any direction. Password Unlocking: Supports touch password input and features a false password function, allowing the door to be opened even if interference codes are entered before and after … Read more