View the directory, enter the directory and jump
ls: View the current directory
ll: View detailed directory information
Under some Linux distributions, the ll command cannot be used
ls -l
cd: Enter the directory
cd path, where path can be either an absolute path or a relative path
Absolute path: positioned based on the root directory
Relative path: positioned based on the current directory
cd china/, not absolute positioned, nor. The relative positioning of and. is understood to mean searching from the current directory
Absolute paths and relative paths can be used together.
File/directory operation
Create directory
mkdir path [Can also be created with relative positioning, absolute positioning]
mkdir a b c d, you can create 4 directories at a time
Create cascade directories
mkdir -p /path
Delete directory
rm: The meaning of remove, the rm command can be used to delete ordinary files or non-empty directories, rm -rf directory/directory, can be used to delete non-empty directories
rmdir: used to delete directories and must be Empty directory
Copy/Move directory
cp:copy, copy files or directories
cp -r source path new path
cp -r source path new path/[new directory name], then copy + rename Effect
Move directory
mv source path new path/[new directory name]
If a new directory name is added, it will have a renaming effect
Create file
touch path
Output redirection:> , overwrite;>>, append
delete file
rm path
copy/move file
cp path target/[new file name]
mv file path target path[/new file name]
text Creation and viewing of files
View the content of the file
more /path View the content of the file
Space: Scroll backwards, automatically exit to the last screen
ctrl+b: Scroll forward one page ctrl+f: Scroll backwards One page
Press q to exit
less /path
kongge Scroll backwards, and exit automatically when you reach the last screen.
ctrl+b [turn one page forward], ctrl+f [turn one page backward]
less no Baifenghao reminder,
less will not exit automatically when turning to the last page
Press q to exit
The above has introduced Linux terminal learning 1, including aspects of the content. I hope it will be helpful to friends who are interested in PHP tutorials.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Zend Studio 13.0.1
Powerful PHP integrated development environment

DVWA
Damn Vulnerable Web App (DVWA) is a PHP/MySQL web application that is very vulnerable. Its main goals are to be an aid for security professionals to test their skills and tools in a legal environment, to help web developers better understand the process of securing web applications, and to help teachers/students teach/learn in a classroom environment Web application security. The goal of DVWA is to practice some of the most common web vulnerabilities through a simple and straightforward interface, with varying degrees of difficulty. Please note that this software

EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Safe Exam Browser
Safe Exam Browser is a secure browser environment for taking online exams securely. This software turns any computer into a secure workstation. It controls access to any utility and prevents students from using unauthorized resources.