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How to check the number of last lines of a file in Linux

How to check the number of last lines of a file in Linux

In Linux systems, there are many ways to view the last few lines of a file. The following will introduce several common methods and give specific code examples. Method 1: Use the tail command. The tail command is a very convenient tool that can display the content at the end of the file. You can specify how many lines to display by adding the -n parameter. The following is a sample code: tail-n10filename.txt The above code will display the last 10 lines of the file filename.txt. Can be based on specific

Feb 23, 2024 pm 11:54 PM
linux 文件 末尾
Learn more about the usage of Linux chage command

Learn more about the usage of Linux chage command

Detailed explanation of how to use the Linuxchage command. In Linux systems, the chage command is a tool used to change user account and password expiration information. By using the chage command, you can set the password expiration time, modify the account lock date, and view account and password expiration information. This article will introduce in detail how to use the chage command in Linux systems, and provide specific code examples to help users better understand and master this powerful command. 1.chage command basic syntax ch

Feb 23, 2024 pm 11:48 PM
linux 命令 chage
Introducing the common working modes of Vim editor

Introducing the common working modes of Vim editor

Introduction to the commonly used working modes of the Vim editor Vim is a powerful text editor that is widely used in the work of programmers and system administrators. It provides multiple working modes, allowing users to edit and process files efficiently. This article will introduce the commonly used working modes in Vim and provide specific code examples. 1. Normal Mode (Normal Mode) In Vim, normal mode is the default mode. In normal mode, users can browse file contents, move the cursor, copy and paste text, and other operations. Here are some

Feb 23, 2024 pm 11:39 PM
命令模式 插入模式 可视模式
Linux operation tips: How to quickly find the current user

Linux operation tips: How to quickly find the current user

Title: Linux Operation Tips: Quickly Get the Current Username In the Linux system, getting the current username is a frequently used operation. By getting the current user name, we can perform some operations with specific permissions, or execute different commands according to different users. This article will introduce several methods to quickly obtain the current username and provide specific code examples. 1. Get the current username through the command line: In Linux systems, we can use the whoami command to get the current username. whoami will

Feb 23, 2024 pm 10:18 PM
linux 操作 用户名 shell脚本
Learn the parameters and usage of Linux chage command

Learn the parameters and usage of Linux chage command

Title: In-depth understanding of the parameters and functions of the Linuxchage command. As one of the most popular operating systems in the world, the Linux operating system is favored by users for its powerful functions and flexibility. In Linux systems, the chage command is a very useful tool for managing user information such as password expiration and account expiration. Through this command, administrators can easily control users' password policies and enhance system security. This article will delve into the parameters and functionality of the Linuxchage command, as well as

Feb 23, 2024 pm 08:45 PM
修改密码策略 linux操作系统
View the path of files in Linux system

View the path of files in Linux system

Viewing the full path of a file in a Linux system is very simple. You can use the pwd command to print the absolute path of the current working directory, or use the readlink command to view the absolute path of a specified file. Specific code examples will be introduced below: Use the pwd command to view the absolute path of the current working directory: $pwd Executing this command will print out the absolute path of the current working directory, for example: /home/user/documents Use the readlink command to view the absolute path of the specified file

Feb 23, 2024 pm 08:45 PM
linux 查看 文件路径
An in-depth discussion of how to start a Linux process

An in-depth discussion of how to start a Linux process

In-depth understanding of the startup method of Linux processes The Linux operating system is an open source operating system, and its process startup method and management mechanism are the basis for system operation. In Linux, there are many ways to start a process, including through shell commands, system calls, daemons, etc. This article will provide an in-depth introduction to how to start a Linux process through specific code examples. 1. Start the process through the shell command. In Linux, we can start the process by entering the command in the shell.

Feb 23, 2024 pm 08:42 PM
深入理解 启动方式 linux 进程 linux操作系统 shell脚本
Complete introduction and usage of Linux read command

Complete introduction and usage of Linux read command

Title: Linux read command detailed explanation and usage guide In Linux systems, the read command is a very commonly used command, used to read data from standard input or files and assign the data to variables. Its usage is simple and flexible, and can help users achieve various interactive operations. This article will introduce the syntax, parameters and specific code examples of the read command in detail to help readers better understand and master the command. 1. Read command syntax and parameters The basic syntax of the read command is as follows: read[select

Feb 23, 2024 pm 07:21 PM
linux 用法 read
How to quickly display the last few lines of a file in Linux

How to quickly display the last few lines of a file in Linux

How to quickly view the last few lines of a file in Linux In Linux systems, you often encounter situations where you need to view the last few lines of a file, such as viewing the latest lines of a log file. In this case, we can use some commands to quickly see what is at the end of the file. Some common methods will be introduced below and specific code examples will be provided. Using the tail command The tail command is a very common command used to view the content at the end of a file. You can specify the number of lines to be displayed through the tail command, where -t is selected.

Feb 23, 2024 pm 06:21 PM
linux 文件 查看
How to check the current directory in Linux?

How to check the current directory in Linux?

In Linux systems, you can use the pwd command to display the current path. The pwd command is the abbreviation of PrintWorkingDirectory and is used to display the path of the current working directory. Enter the following command in the terminal to display the current path: pwd After executing this command, the terminal will display the full path of the current working directory, such as: /home/user/Documents. In addition, you can use some other options to enhance the functionality of the pwd command. For example, the -P option can display

Feb 23, 2024 pm 05:54 PM
linux 显示 当前路径
Linux read command function analysis and example demonstration

Linux read command function analysis and example demonstration

"Linuxread Command Function Analysis and Example Demonstration" In Linux systems, the read command is a command used to read data from standard input or files. It can help users interactively obtain data from user input in Shell scripts, and can save it to variables for subsequent processing. This article will analyze the functions of the read command and provide example demonstrations to help readers better understand. 1. Basic syntax of read command The basic syntax of read command is as follows: read[-o

Feb 23, 2024 pm 05:06 PM
linux 演示 read shell脚本
Learn advanced application tips for Linux pipe commands

Learn advanced application tips for Linux pipe commands

To understand the advanced application skills of Linux pipeline commands, specific code examples are required. In Linux systems, pipeline commands are a very powerful and flexible tool that can connect multiple commands together to achieve data transfer and processing. Proficient in advanced application skills of pipeline commands can improve work efficiency and simplify complex data processing processes. This article will introduce some commonly used advanced application techniques and attach specific code examples to help readers better understand. 1.Multiple pipesMultiple pipes refer to using multiple pipes in one command

Feb 23, 2024 pm 04:57 PM
linux 应用 管道
CentOS File System FAQ

CentOS File System FAQ

CentOS file system FAQ The file system is a crucial component in using the CentOS operating system. It is responsible for storing, organizing and managing files and directories, and plays a vital role in the stable operation of the system and data security. However, inevitably, you will encounter some common problems when using file systems. This article will answer common questions about the CentOS file system, hoping to help readers better understand and deal with these problems. Question 1: How to check the usage of file system

Feb 23, 2024 pm 12:45 PM
centos 解答 文件系统 数据丢失
Detailed explanation and configuration method of Linux PATH environment variable

Detailed explanation and configuration method of Linux PATH environment variable

Detailed explanation of LinuxPATH environment variable and configuration method In Linux systems, the PATH environment variable is a very important environment variable. It is used to specify which directories the system searches for executable files. By configuring the PATH environment variable, you can easily execute commands and programs in the system. In this article, we will explain the role and configuration method of the PATH environment variable in detail, and provide specific code examples. What is the PATH environment variable? The PATH environment variable is a string containing a series of directory paths,

Feb 23, 2024 pm 12:42 PM
linux 环境变量 path

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