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!
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