Linux | Red Hat Certified | IT Technology | Operations Engineer 👇 Join our technical exchange QQ group with a note【Public Account】for faster approval Before explaining the permission issues, I would like to briefly introduce the essence of commands and the role of the command line interpreter. Introduction 01 The Essence of Commands Entering a … Read more
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
1. Basic Permissions Permission Basics Users and Groups File Owner (User): The user who created the file, possessing the highest level of control. Group: A set of users that share file permissions. Others: Users who are neither the owner nor part of the group. Three Basic Permissions Read <span>r=4</span>: Permission to read. View file contents … Read more
In the world of Linux, file management is a core task. Whether system administrators are maintaining servers or developers are searching for specific code files, quickly and accurately locating files is crucial. 1. Basic Syntax of the ‘find’ Command The basic syntax of the ‘find’ command is: find [search path] [expression] Search path: Specifies the … Read more
1. The “Genetic Code” of File Permissions 1. File Type Identifiers First Character File Type Typical Examples d Directory /home, /var/log – Regular File index.html, app.py l Symbolic Link /usr/bin/python3 → python3.9 b/c Block Device/Character Device File /dev/sda (disk), /dev/ttyS0 (serial port) 2. Structure of Permission Triplets The permissions for each user type are composed … Read more
The design philosophy of “everything is a file” is commendable, as it abstracts hardware and processes into files for unified operations. However, this approach becomes less effective in scenarios requiring bidirectional communication, such as network communication, where operating sockets through file read/write operations feels awkward. Windows’ “everything is a handle” is more flexible, as a … Read more
Task: Use commands to complete the following operations 1. Create directories<span>/home/guestuser1/work1</span> and <span>/home/guestuser/work2</span> mkdir /home/guestuser1/work1 /home/guestuser/work2 2. Change the current directory to<span>/home/guestuser/work1</span> cd /home/guestuser/work1 3. Display the current path: pwd 4. Switch to the root directory; cd / 5. Display all contents in the current directory (including hidden files); ls -a # or ll -a … Read more
Linux | Red Hat Certification | IT Technology | Operations Engineer 👇 Join our technical exchange QQ group with 1000 members, note 【public account】 for faster approval 1. Introduction to Shell Commands Before understanding Linux operating permissions, let’s add a knowledge point: shell – command line interpreter. For Linux, it is the operating system, which … Read more