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- To ensure system security, we will teach you various methods to prohibit user login in Linux!
- Security is an issue that every Linux system administrator must pay attention to and pay attention to, and prohibiting certain users from logging into the system is one of the very important security measures. This article will introduce in detail through examples how to prohibit certain users from logging in in the Linux system to protect system security. By default, when creating a user account in Linux, the user has shell access. In some cases a user account login shell is not required. This article describes how to disable shell login for existing users and disable shell login when creating users. Disable shell login when creating a user. By default, when a user is created, the user will be assigned sh as defined in the /etc/default/useradd file.
- LINUX 573 2024-02-14 17:33:22
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- Detailed explanation of strings in python
- 1. Naming rules for variable naming C/C++ identifiers: variable names can only contain letters, numbers, and underscores, and cannot start with numbers. C/C++ keywords and function names cannot be used as variable names. The rules for naming variables are similar to the naming rules for C/C++ identifiers: variable names can only contain letters, numbers, and underscores, and cannot start with a number. You cannot use python keywords and function names as variable names. In addition, when we choose a name, we try our best to understand the meaning of the name (with a certain degree of descriptiveness). 2. python string In python, everything enclosed in quotation marks is a string (it can be single quotation mark or double quotation mark). Although, the string can be single quotation mark or double quotation mark.
- LINUX 947 2024-02-14 17:30:30
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- How to securely transfer files using SCP in Linux
- File transfers over the network can be accomplished through a variety of different methods and protocols. The most commonly used protocols for remote copying files are Rsync, SCP and SFTP. In this article, we will learn what SCP is and how to use SCP in Linux and Unix-like operating systems to securely transfer files between local and remote computers. What are SCPs? SCP, which stands for SecureCopy, is a command-line program that copies files and directories between a local and a remote system, or between two remote systems, in a secure manner in Linux and Unix-like operating systems. Using the scp command, you can safely copy files or directories: ◈ From local to remote system ◈ From remote system to local ◈ Between two
- LINUX 1163 2024-02-14 17:30:17
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- Detailed explanation of two extremely useful and important text manipulation commands on Linux
- The Linux system makes text manipulation and processing very easy through a large number of commands. Command line tools like tr and fmt can help you change, format and modify text files from the terminal. In this article, we will discuss how to format text using tr and fmt commands in different situations. So, what are tr and fmt? And how do you use them? What is the tr command? The tr command is the abbreviation of the word translate, which can help users delete or replace specific characters in text files. It is typically used in conjunction with other commands and works by taking standard input, performing operations on it, and writing the results to standard output. tr command syntax The basic syntax of the tr command is: tr[option]...SE
- LINUX 616 2024-02-14 17:27:03
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- Installing Steam on Tongxin UOS: Detailed Guide and Sharing of Tips
- With the popularity of the Linux operating system, more and more users are beginning to try to play games on the Linux platform. As a well-known Linux distribution in China, Tongxin UOS has also attracted the attention of many users. This article will introduce in detail how to play games on Tongxin Install Steam on UOS so that users can enjoy games on the platform. Preparations before installation Before starting the installation, please make sure that your UOS system is connected to the Internet and meets the following conditions: 1. The system has been updated to the latest version; 2. The necessary system components have been installed. Install Steam1. Open the UOS app store; 2. Enter "Steam" in the search box and press Enter; 3. Find the "Steam" application in the search results and click "Install"
- LINUX 765 2024-02-14 17:24:15
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- SMB installs CentOS and CentOS installs Samba
- In Linux systems, Samba is a very important tool that allows file and printer sharing between Linux systems and Windows systems. Samba provides a simple and effective method to achieve cross-platform file sharing, so that Linux systems can Seamlessly connected to Windows systems, this article will introduce how to install Samba on CentOS and configure file sharing. CentOS, as a popular Linux distribution, provides an easy and fast way to install and configure Samba. Here are the steps to install Samba on CentOS: Before installing any software, we should update the system to get the latest software packages. and security patches, open the terminal
- LINUX 667 2024-02-14 17:15:07
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- Explore the mysteries of Linux kernel modules
- In the Linux operating system, the kernel is the core part, which controls the interaction between computer hardware and software. The kernel module is an important concept in the kernel. It can be dynamically loaded into the kernel at runtime, thus extending the functionality of the kernel. In this article, we'll take a deep dive into how Linux kernel modules work and are made up of, and explain how to write your own. Linux kernel modular design 1. Linux kernel design: single kernel, modular (dynamic loading and unloading) (1) Linux: single kernel design, but fully drawing on the advantages of the microkernel system design; introducing a modular mechanism to the kernel ; (2) Components of the kernel: kernel: kernel core, usually in bzImage format, usually
- LINUX 726 2024-02-14 17:10:17
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- Ubuntu installation tutorial and Ubuntu installation tutorial 20.04
- LINUX is an open source operating system known for its stability, security and flexibility. Ubuntu is one of the most popular distributions in the LINUX system. This article will introduce you to the installation process of Ubuntu and provide details. Instructions on how to install Ubuntu20.04 version. Ubuntu installation tutorial preparation Before starting to install Ubuntu, you need to prepare the following materials: 1. An idle computer 2. An Ubuntu installation CD or USB drive 3. Make sure the computer meets the minimum system requirements for Ubuntu Create installation media 1. Download Image file of Ubuntu20.04 and save it on your computer. 2. If you are using a CD, leave blank
- LINUX 1405 2024-02-14 17:09:08
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- How to make a file readable, writable, and read-only under Linux?
- In the process of Linux operation and maintenance, we often encounter that the storage directory of an application is full, without any planning in advance, and the directory or disk cannot be expanded. At this time, our common solution is to make a soft link and use ln to The original stored directory is soft-linked to a directory in another large disk to achieve the purpose. The disadvantage of soft links is that after multiple layers of soft links, they will be confused and it is easy to cause misoperation. Today I will introduce a method called mount-bindmount command that operation and maintenance friends should be familiar with. Without going into too much introduction, let’s take a look at it first. According to the introduction in man, mount-bind can be used to remount the file directory structure and connect two directories. It mounts the former directory to the latter directory, and all the changes to the latter directory are
- LINUX 750 2024-02-14 17:00:03
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- Linux server monitoring tool: Installation and use of Netdata
- Netdata can be installed on most Linux distributions (such as Ubuntu, Debian, CentOS, etc.), container platforms (such as Kubernetes clusters, Docker), and many other operating systems (such as FreeBSD, macOS) without sudo permissions. Netdata is designed by system administrators, DevOps engineers, and developers to collect all the information to help you visualize metrics, solve complex performance problems, and make the data interoperable with other parts of the monitoring stack. Netdata features: 1. High real-time performance. Netdata and plug-ins are written in C, and resource usage and efficiency meet the requirements. 2. Does not occupy system IO, except for the log system, N
- LINUX 1297 2024-02-14 17:00:03
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- 6 ways to configure Linux environment variables, recommended to collect!
- Linux environment variable configuration When customizing software installation, it is often necessary to configure environment variables. Listed below are various methods of configuring environment variables. The environment description of all the examples below is as follows: System: Ubuntu14.0 User name: uusama Need to configure MySQL environment variables Path: /home/uusama/mysql/binLinux Reading environment variables Method of reading environment variables: The export command displays the current system definition All environment variables echo$PATH command outputs the value of the current PATH environment variable. The effect of executing these two commands is as follows uusama@ubuntu:~exportdeclare-xHOME="/home/uu
- LINUX 450 2024-02-14 17:00:03
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- Loongson Tongxin UOS installation and Loongson system installation
- Here I would like to introduce to you the installation of Loongson UOS and the installation of the Loongson system. With the continuous development of domestic operating systems, Loongson UOS has become a system that attracts much attention, and the Loongson processor is independently developed in my country. The processor and its system installation also have their own characteristics. Let us take a look at them below. To install Loongson UOS, we need to download the image file of Loongson UOS from the official website, and then burn it to a U disk. Next, insert the U disk into the USB interface of the Loongson computer, restart the computer and enter the BIOS settings, select from Start the USB disk, enter the system installation interface, and follow the prompts to install. During the installation process, you need to pay attention to choosing the correct installation method and partitioning method to ensure that the system
- LINUX 857 2024-02-14 16:51:07
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- Where is the Tongxin uos software installation package - in-depth analysis and how to obtain it
- In today's information age, the operating system, as the soul of the computer, plays a vital role, and UOS, as a domestically independently developed operating system, has attracted much attention. When many users first come into contact with UOS, , we often encounter a question: How to find and install the required software? This article will analyze in detail the location of the software installation packages of UOS and how to obtain these installation packages to help users better use UOS. Overview of the Unison uos software warehouse. Unison uos uses the standard Linux software warehouse mechanism, which means that it uses package managers such as RPM or DPKG. Users can obtain and install from predefined software warehouses through these package managers. software, these software repositories usually contain many common
- LINUX 1356 2024-02-14 16:27:18
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- Linux kernel thread priority setting and adjustment: How to improve kernel thread performance and response
- The kernel thread is a special thread in the Linux system. It runs in the kernel space and is responsible for performing some kernel-related tasks and functions. The performance and response of kernel threads directly affect the stability and efficiency of the system. Therefore, it is very necessary to understand and set the priority of kernel threads. But, do you really understand the priority of Linux kernel threads? Do you know how to set and adjust the priority of kernel threads under Linux? Do you know how to improve kernel thread performance and responsiveness under Linux? This article will introduce you to the relevant knowledge of Linux kernel thread priority in detail, so that you can better use and understand this important kernel parameter under Linux. Personal understanding is that kernel-level threads and processes are the same, and the former is the same as P
- LINUX 785 2024-02-14 16:15:13
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- Do you know the difference between interactive shell and profile?
- Reprinted from: /u010127245/article/details/51689636 The difference between bashrc and profile. The difference between bashrc and profile. First of all, we must understand which are interactive shells and non-interactive shells, and which are login shells and non-login shells. Interactive mode means that the shell waits for your input, but executes the commands you submit. These modes are called interactive because the shell interacts with the user. These modes are also familiar to most users: logging in, executing some commands, and logging out. When you sign back, the shell also terminates. The shell can also run in another mode
- LINUX 852 2024-02-14 16:09:02
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