JavaScript Scripting: Powerful Tools Beyond Browser Limits
This article explores the possibility of writing shell scripts using JavaScript, and how to use Node.js to implement features such as file system traversal and text search.
Key points:
- JavaScript applications are no longer limited to browsers, they can be effectively used for desktop scripting, including shell scripting. Node.js is a necessary condition for this process.
- JavaScript can recursively iterate over files in directories and recognize the occurrence of specified strings. This allows you to identify directories using Node's native file system module (including the readdir method) and the lstatSync method.
- Shell scripts can be written to identify specific file types (such as PHP files) and search for the occurrence of specific strings in these files. This can be done using regular expressions and JavaScript's match methods.
- JavaScript's shell scripting capabilities can be further expanded by automating the process using replace() and fs.writeFileSync, or opening files for editing using child_process.exec. JavaScript files can also be set as executable, and the language can be used for a variety of tasks that are beyond the scope of the browser, including automated scripting tasks.
Case: Website SSL Upgrade and Mixed Content Warning
The author uses upgraded customer website to SSL as an example to illustrate the practical application scenario of writing shell scripts using JavaScript. After upgrading, there are a large number of mixed content warnings, and you need to traverse files in the WordPress theme directory to find out what resources are referenced using HTTP. The author originally used Ruby scripts, but this article aims to demonstrate the power of JavaScript in desktop scripting.
Detailed explanation of the steps:
-
Environment settings: The only premise is to install Node.js.
-
Travel over the directory: Use the
fs
method in thereaddir
module of Node to iterate over files in the topic directory. -
Recursive iteration: Use the
fs.lstatSync
method to determine whether the file is a directory. If it is a directory, thebuildTree
function will be called recursively. -
Identify file types: Use regular expressions
/.php$/
to identify PHP files. -
File content search: Use
fs.readFileSync
to read the file content, use thesplit
method to split by line, and use thematch
method to search for the specified string (for example, "http://") ). -
Advanced Applications: You can use
replace()
andfs.writeFileSync
to automatically replace strings, or usechild_process.exec
to open files for editing.
Summary:
This article shows how to write shell scripts in JavaScript to implement file system traversal and text search. JavaScript has been used far beyond the browser, and it also has powerful capabilities in desktop scripting and can be used to automate various tasks.
FAQs:
(The lengthy FAQ part of the original text is omitted here, because these issues are not highly correlated with the topic of the article and are too long, so you can add them separately as needed.)
The above is the detailed content of How to Write Shell Scripts with JavaScript. For more information, please follow other related articles on the PHP Chinese website!

JavaScript originated in 1995 and was created by Brandon Ike, and realized the language into C. 1.C language provides high performance and system-level programming capabilities for JavaScript. 2. JavaScript's memory management and performance optimization rely on C language. 3. The cross-platform feature of C language helps JavaScript run efficiently on different operating systems.

JavaScript runs in browsers and Node.js environments and relies on the JavaScript engine to parse and execute code. 1) Generate abstract syntax tree (AST) in the parsing stage; 2) convert AST into bytecode or machine code in the compilation stage; 3) execute the compiled code in the execution stage.

The future trends of Python and JavaScript include: 1. Python will consolidate its position in the fields of scientific computing and AI, 2. JavaScript will promote the development of web technology, 3. Cross-platform development will become a hot topic, and 4. Performance optimization will be the focus. Both will continue to expand application scenarios in their respective fields and make more breakthroughs in performance.

Both Python and JavaScript's choices in development environments are important. 1) Python's development environment includes PyCharm, JupyterNotebook and Anaconda, which are suitable for data science and rapid prototyping. 2) The development environment of JavaScript includes Node.js, VSCode and Webpack, which are suitable for front-end and back-end development. Choosing the right tools according to project needs can improve development efficiency and project success rate.

Yes, the engine core of JavaScript is written in C. 1) The C language provides efficient performance and underlying control, which is suitable for the development of JavaScript engine. 2) Taking the V8 engine as an example, its core is written in C, combining the efficiency and object-oriented characteristics of C. 3) The working principle of the JavaScript engine includes parsing, compiling and execution, and the C language plays a key role in these processes.

JavaScript is at the heart of modern websites because it enhances the interactivity and dynamicity of web pages. 1) It allows to change content without refreshing the page, 2) manipulate web pages through DOMAPI, 3) support complex interactive effects such as animation and drag-and-drop, 4) optimize performance and best practices to improve user experience.

C and JavaScript achieve interoperability through WebAssembly. 1) C code is compiled into WebAssembly module and introduced into JavaScript environment to enhance computing power. 2) In game development, C handles physics engines and graphics rendering, and JavaScript is responsible for game logic and user interface.

JavaScript is widely used in websites, mobile applications, desktop applications and server-side programming. 1) In website development, JavaScript operates DOM together with HTML and CSS to achieve dynamic effects and supports frameworks such as jQuery and React. 2) Through ReactNative and Ionic, JavaScript is used to develop cross-platform mobile applications. 3) The Electron framework enables JavaScript to build desktop applications. 4) Node.js allows JavaScript to run on the server side and supports high concurrent requests.


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

Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!

Hot Article

Hot Tools

SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.

mPDF
mPDF is a PHP library that can generate PDF files from UTF-8 encoded HTML. The original author, Ian Back, wrote mPDF to output PDF files "on the fly" from his website and handle different languages. It is slower than original scripts like HTML2FPDF and produces larger files when using Unicode fonts, but supports CSS styles etc. and has a lot of enhancements. Supports almost all languages, including RTL (Arabic and Hebrew) and CJK (Chinese, Japanese and Korean). Supports nested block-level elements (such as P, DIV),

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

Dreamweaver Mac version
Visual web development tools

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