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26 basic things you should know about Linux commands for newbies

26 basic things you should know about Linux commands for newbies

When you enter the world of Linux, after downloading and installing a certain Linux distribution, experiencing the Linux desktop, and installing some software you like and need, you should understand the real charm of Linux: the command line. Every Linux command is actually a program. With the help of these commands, we can do a lot of things. Below we will introduce you to several commonly used commands. How to get help? When encountering problems under Linux, the most important thing is to seek help yourself. Here are three ways to seek help. manman is the Linux help manual, that is, manual. Because most programs come with their own manuals, you can get help through the man command. After execution, in ma

Jan 05, 2024 am 11:28 AM
Linux Linux系统 红帽 Linux命令 linux认证 红帽linux linux教程 linux视频
Learn PHP Regular Expressions: A Guide to Mastering Common Syntax

Learn PHP Regular Expressions: A Guide to Mastering Common Syntax

PHP Regular Expression Guide: Mastering common expression syntax requires specific code examples Introduction: Regular expressions are a very powerful tool in PHP development. It can help us complete various string matching, replacement and extraction operations. However, the syntax of regular expressions is relatively complex and may be a bit confusing for beginners. In this guide, we will focus on some commonly used regular expression syntax and provide specific code examples to help readers gain a better grasp. 1. Basic syntax: character matching: in regular tables

Jan 05, 2024 am 11:01 AM
PHP正则表达式 表达式语法 掌握常用
Java crawler to crawl web data: A complete guide from beginner to expert

Java crawler to crawl web data: A complete guide from beginner to expert

From beginner to proficient: Mastering the entire process of Java crawler crawling web page data requires specific code examples. In today's Internet era, capturing and analyzing web page data has become an important skill. Whether searching for information from the Internet or extracting data from web pages, crawler technology plays an important role. This article will introduce how to use the Java programming language to implement a simple crawler program and provide corresponding code examples. 1. Understand the basic concepts and principles of crawlers. Spiders, also known as web spiders, are

Jan 05, 2024 am 10:58 AM
入门 (Beginner) Java爬虫 (Java crawler) 抓取网页数据 (Web scraping)
PHP Regular Expression Debugging Guide: Quickly Find and Solve Matching Issues

PHP Regular Expression Debugging Guide: Quickly Find and Solve Matching Issues

PHP regular expression debugging tips: quickly locate and fix matching problems Introduction: Regular expressions are a powerful text matching tool and are widely used in various programming languages. In PHP, regular expressions also play an important role. However, debugging matching issues can be difficult due to the complexity and flexibility of regular expressions. This article will introduce some PHP regular expression debugging techniques, and use specific code examples to help readers quickly locate and fix matching problems. 1. Use the preg_match() function to

Jan 05, 2024 am 10:57 AM
调试 正则表达式 定位
In-depth analysis of the technology of converting strings to floating point numbers

In-depth analysis of the technology of converting strings to floating point numbers

Overview of conversion technology analysis from strings to floating point numbers In programming, it is often necessary to convert strings into floating point numbers for numerical operations or other processing. This article will explore common string-to-floating-point conversion techniques and provide specific code examples. 1. Conversion using built-in functions Most programming languages ​​provide built-in functions to convert strings to floating point numbers. For example, in Python, you can use the float() function to convert a string into a floating point number. Here is a simple code example: str_num=&q

Jan 05, 2024 am 09:20 AM
字符串 转换技术 浮点数
Seven secrets about Linux systems that you may not know yet

Seven secrets about Linux systems that you may not know yet

Linux is a Unix-like operating system that is free to use and spread freely. It is a multi-user, multi-task, multi-thread and multi-CPU operating system based on POSIX and UNIX. It can run major UNIX software tools, applications and network protocols. It supports 32-bit and 64-bit hardware. Linux inherits the network-centric design philosophy of Unix and is a multi-user network operating system with stable performance. One of the coolest parts of using Linux is gaining new knowledge over time. Every day, you might come across a new utility, or, perhaps, an unfamiliar flag that does something useful. These small details may not always change lives, but they are professional knowledge

Jan 05, 2024 am 08:16 AM
Linux系统
Using Java crawlers: Practical methods and techniques for efficiently extracting web page data

Using Java crawlers: Practical methods and techniques for efficiently extracting web page data

Java crawler practice: Methods and techniques for quickly crawling web page data Introduction: With the development of the Internet, massive information is stored in web pages, and it becomes increasingly difficult for people to obtain useful data from it. Using crawler technology, we can quickly and automatically crawl web page data and extract the useful information we need. This article will introduce methods and techniques for crawler development using Java, and provide specific code examples. 1. Choose the appropriate crawler framework. In the Java field, there are many excellent crawler frameworks to choose from, such as Jso

Jan 05, 2024 am 08:15 AM
数据 爬虫 抓取
20 essential commands for system administrators

20 essential commands for system administrators

Introduction In this booming environment of new tools and diverse development environments, it is necessary for any developer and engineer to learn some basic system management commands. Specific commands and toolkits help developers organize, troubleshoot, and optimize their applications, while also providing operators and system administrators with valuable triage information when errors occur. Whether you are a novice developer or looking to manage your own applications, the following 20 basic system administration commands can help you better understand your applications. They can also help troubleshoot system failures such as why an application works locally but not on a remote host. These commands apply to Linux development environments, containers, and virtual machines. 1.curlc

Jan 04, 2024 am 09:05 AM
Linux Linux系统 红帽 Linux命令 linux认证 红帽linux linux教程 linux视频
Vim shortcut key list

Vim shortcut key list

The Vim editor is a command line-based tool that is an enhanced version of the legendary editor vi. Although there are many rich text editors with graphical interfaces, familiarity with Vim can be helpful to every Linux user - whether you are an experienced system administrator or a novice user who has just started using Raspberry Pi. This lightweight editor is a very powerful tool. In the hands of an experienced user, it can do incredible things. In addition to regular text editing functions, it also supports some advanced features. For example, regular expression-based search and replacement, encoding conversion, and programming features such as syntax highlighting, code folding, etc. There is a very important point to note when using Vim, that is, the function of the keys depends on the current editor

Jan 03, 2024 pm 01:30 PM
Linux Linux系统 红帽 Linux命令 linux认证 红帽linux linux教程 linux视频
How to use awk's special modes BEGIN and END for processing

How to use awk's special modes BEGIN and END for processing

In the eighth section of the awk series, we introduced some powerful awk command functions, which are variables, numeric expressions and assignment operators. In this section we will learn more about awk functions, namely awk's special modes: BEGIN and END. As we progress and discover more ways to build complex awk operations, we will prove how powerful these special features of awk are. Before we start, let us review the introduction of the awk series. Remember when we started this series, I pointed out that the general syntax of the awk instruction is like this: #awk'script'filenames In the above syntax, the awk script has this form :/pattern/{actions} you will usually find

Jan 02, 2024 pm 06:06 PM
Linux Linux系统 红帽 Linux命令 linux认证 红帽linux linux教程 linux视频
In-depth analysis of the usage of semanage command

In-depth analysis of the usage of semanage command

Introduction The semanage command is used to query and modify the security context of the SELinux default directory. SELinux policy and rule management related commands: seinfo command, sesearch command, getsebool command, setsebool command, semanage command. Let us explain in detail how to use the chcon command. Syntax semanage{login|user|port|interface|fcontext|translation}-lsemanagefcontext-{a|d|m}[-frst]file_spec option --l: query. fcon

Jan 02, 2024 am 11:48 AM
Linux Linux系统 红帽 Linux命令 linux认证 红帽linux linux教程 linux视频
Golang Essentials: Revealing the Secrets of Commonly Used Standard Libraries!

Golang Essentials: Revealing the Secrets of Commonly Used Standard Libraries!

Golang Essentials: Revealing the Secrets of Commonly Used Standard Libraries! Overview: Golang (or Go) is an open source programming language developed by Google. It is favored by developers for its simplicity, efficiency and powerful concurrency capabilities. As a modern programming language, Golang has a rich standard library that covers a variety of different fields and functions. This article will focus on the commonly used standard libraries in Golang and their application in actual development. 1. fmtfmt is the most commonly used standard in Golang

Dec 29, 2023 pm 04:21 PM
Golang 标准库 大揭秘
Master the greedy and non-greedy mode skills of Java regular expressions

Master the greedy and non-greedy mode skills of Java regular expressions

Java regular expression syntax tips: Greedy mode and non-greedy mode When using Java's regular expressions, you often encounter situations where you need to match as many characters as possible or as few characters as possible. This requires using greedy mode and non-greedy mode to control the matching method. This article will introduce these two modes in detail and give specific code examples. 1. Greedy mode Greedy mode is the default matching method. In greedy mode, the regular expression matches as many characters as possible until the matching condition is no longer met. For example, we have the following text: S

Dec 26, 2023 pm 02:33 PM
Java 正则表达式 贪婪模式 非贪婪模式
An in-depth analysis of Java regular expressions: syntax of quantifiers, character classes, and boundary matching

An in-depth analysis of Java regular expressions: syntax of quantifiers, character classes, and boundary matching

Detailed explanation of Java regular expression syntax: quantifiers, character classes and boundary matching Regular expressions are widely used in string matching and processing in Java. This article will introduce quantifiers, character classes and boundary matching in regular expressions in detail, and give specific code examples. 1. Quantifier Quantifier is used to specify the number of repetitions of a matching rule. Commonly used quantifiers in Java include: *: Matches the previous character 0 or more times. +: Matches the previous character 1 or more times. ?: Match the previous character 0 or 1 times. {n}: matches the previous character

Dec 26, 2023 pm 12:39 PM
Java正则表达式语法详解 量词 (Quantifiers) + (一个或多个)

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