Executing Command Line Binaries in Node.js
Executing third-party binaries is an essential task when porting CLI libraries from other languages to Node.js. To achieve this in Node.js, there are several modules available:
child_process.exec
For buffered output, use exec:
const { exec } = require('child_process');
exec('cat *.js bad_file | wc -l', (err, stdout, stderr) => {
if (err) return; // Node couldn't execute the command
console.log(`stdout: ${stdout}`);
console.log(`stderr: ${stderr}`);
});
child_process.spawn
If you prefer to receive output as a stream, use spawn:
const { spawn } = require('child_process');
const child = spawn('ls', ['-lh', '/usr']);
// For text chunks, use `child.stdout.setEncoding('utf8');`
child.stdout.on('data', (chunk) => { /* data in chunks */ });
// Pipe the stream elsewhere
child.stderr.pipe(dest);
child.on('close', (code) => { console.log(`Exited with code ${code}`); });
Synchronous Options
Node.js also provides synchronous counterparts to the exec and spawn functions:
const { execSync } = require('child_process');
let stdout = execSync('ls');
const { spawnSync} = require('child_process');
const child = spawnSync('ls', ['-lh', '/usr']);
console.log('error', child.error);
console.log('stdout ', child.stdout);
console.log('stderr ', child.stderr);
Historical Support
For versions of Node.js prior to ES5, the following methods were commonly used:
// Complete output as a buffer
var exec = require('child_process').exec;
exec('prince -v builds/pdf/book.html -o builds/pdf/book.pdf',
function(error, stdout, stderr) { // command output in stdout });
// Handling large output chunks with streams
var spawn = require('child_process').spawn;
var child = spawn('prince', ['-v', 'builds/pdf/book.html', '-o', 'builds/pdf/book.pdf']);
// Output in chunks
child.stdout.on('data', (chunk) => { /* data in chunks */ });
// Piping output
child.stdout.pipe(dest);The above is the detailed content of How to Execute Command Line Binaries in Node.js?. For more information, please follow other related articles on the PHP Chinese website!
Hot AI Tools
Undress AI Tool
Undress images for free
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
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
Notepad++7.3.1
Easy-to-use and free code editor
SublimeText3 Chinese version
Chinese version, very easy to use
Zend Studio 13.0.1
Powerful PHP integrated development environment
Dreamweaver CS6
Visual web development tools
SublimeText3 Mac version
God-level code editing software (SublimeText3)
Hot Topics
JavaScript vs. Java: Which Language Should You Learn?
Jun 10, 2025 am 12:05 AM
JavaScriptisidealforwebdevelopment,whileJavasuitslarge-scaleapplicationsandAndroiddevelopment.1)JavaScriptexcelsincreatinginteractivewebexperiencesandfull-stackdevelopmentwithNode.js.2)Javaisrobustforenterprisesoftwareandbackendsystems,offeringstrong
JavaScript Comments: A Guide to Commenting Your Code
Jun 09, 2025 am 12:02 AM
JavaScriptcommentsareessentialforwritingmaintainableandunderstandablecode.1)Theyhelpexplainthepurposeandfunctionalityofcode,aidingindebugging,maintenance,andcollaboration.2)Therearesingle-linecommentsforquicknotesandmulti-linecommentsforlongerexplana
Which Comment Symbols to Use in JavaScript: A Clear Explanation
Jun 12, 2025 am 10:27 AM
In JavaScript, choosing a single-line comment (//) or a multi-line comment (//) depends on the purpose and project requirements of the comment: 1. Use single-line comments for quick and inline interpretation; 2. Use multi-line comments for detailed documentation; 3. Maintain the consistency of the comment style; 4. Avoid over-annotation; 5. Ensure that the comments are updated synchronously with the code. Choosing the right annotation style can help improve the readability and maintainability of your code.
The Ultimate Guide to JavaScript Comments: Enhance Code Clarity
Jun 11, 2025 am 12:04 AM
Yes,JavaScriptcommentsarenecessaryandshouldbeusedeffectively.1)Theyguidedevelopersthroughcodelogicandintent,2)arevitalincomplexprojects,and3)shouldenhanceclaritywithoutclutteringthecode.
Javascript Comments: short explanation
Jun 19, 2025 am 12:40 AM
JavaScriptcommentsareessentialformaintaining,reading,andguidingcodeexecution.1)Single-linecommentsareusedforquickexplanations.2)Multi-linecommentsexplaincomplexlogicorprovidedetaileddocumentation.3)Inlinecommentsclarifyspecificpartsofcode.Bestpractic
Java vs. JavaScript: Clearing Up the Confusion
Jun 20, 2025 am 12:27 AM
Java and JavaScript are different programming languages, each suitable for different application scenarios. Java is used for large enterprise and mobile application development, while JavaScript is mainly used for web page development.
Mastering JavaScript Comments: A Comprehensive Guide
Jun 14, 2025 am 12:11 AM
CommentsarecrucialinJavaScriptformaintainingclarityandfosteringcollaboration.1)Theyhelpindebugging,onboarding,andunderstandingcodeevolution.2)Usesingle-linecommentsforquickexplanationsandmulti-linecommentsfordetaileddescriptions.3)Bestpracticesinclud
JavaScript Data Types: A Deep Dive
Jun 13, 2025 am 12:10 AM
JavaScripthasseveralprimitivedatatypes:Number,String,Boolean,Undefined,Null,Symbol,andBigInt,andnon-primitivetypeslikeObjectandArray.Understandingtheseiscrucialforwritingefficient,bug-freecode:1)Numberusesa64-bitformat,leadingtofloating-pointissuesli
