129 lines
2.9 KiB
Markdown
129 lines
2.9 KiB
Markdown
title: NodeJS api
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----
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## Globals
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__filename
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__dirname
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## [fs]
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### Reading
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fs.readFile('file.txt', function(err, data) { .. });
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fs.readFile('file.txt', {encoding: 'utf-8'}, function(err, data) { .. });
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### Writing
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fs.writeFile('output.txt', function(err) { .. });
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fs.appendFile('output.txt', function(err) { .. });
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### Watch
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fs.watch('dir OR file.txt', { persistent: true }, function(event, file) {
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event; /* rename | change */
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});
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### Getting info
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fs.exists('file.txt', function(exists /*bool*/) { ... });
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fs.stat('file.txt', function(stats) {
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stats.isFile();
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stats.isDirectory();
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stats.isSymbolicLink();
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});
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### File operations
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fs.rename('old.txt', 'new.txt', function(){});
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fs.chown('file.txt', uid, gid, function(){});
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fs.symlink('src', 'dest', function(){});
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fs.unlink('path', function(){});
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fs.rmdir('path', function(){});
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fs.readdir('path', function(err, files) { .. }); /* `files` = array of names */
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### Path
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fs.realpath('/etc/passwd', function(err, path) { /* "/private/etc/passwd" */ });
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### Sync
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data = fs.readFileSync('input.txt');
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fs.writeFileSync('output.txt', data);
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fs.appendFileSync('output.txt', data);
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fs.existsSync('file.txt');
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## [process]
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### Streams
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process.stdin.resume(); /* paused by default */
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process.stdin.setEncoding('utf8');
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process.stdin.on('data', function(chunk) { ... });
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process.stdin.on('end', function() { ... });
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process.stdout.write('...');
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process.stderr.write('...');
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### stuff
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process.argv; //=> ['node', 'file.js', 'one', 'two']
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process.env; //=> {TERM: 'screen-256color', SHELL: '/bin/bash', ...}
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process.exit();
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process.exit(1);
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### Directories
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process.cwd(); //=> "/tmp"
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process.chdir('dir');
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## [path]
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fs.realpath('/etc/passwd', function(err, path) { /* "/private/etc/passwd" */ });
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dir = path.join('etc', 'passwd');
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dir = path.resolve('/etc', 'passwd', '..', 'var');
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path.dirname('/etc/passwd') //=> "/etc"
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path.basename('/etc/passwd') //=> "passwd"
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path.basename('/etc/rc.d', '.d') //=> "rc"
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### exec
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var exec = require('child_process').exec,
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var child = exec('cat *.js bad_file | wc -l',
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function (error, stdout, stderr) {
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console.log('stdout: ' + stdout);
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console.log('stderr: ' + stderr);
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if (error !== null) {
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console.log('exec error: ' + error);
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}
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});
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## [assert]
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assert(val)
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assert.equal(actual, expected)
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assert.notEqual(a, e)
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assert.deepEqual(a, e)
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assert.notDeepEqual(a, e)
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assert.throws(fn)
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[all]: http://nodejs.org/api/all.html
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[process]: http://nodejs.org/api/process.html
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[fs]: http://nodejs.org/api/fs.html
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## Snippets
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info = require('../package.json')
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info.version
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process.stdout.write(util.inspect(objekt, false, Infinity, true) + '\n');
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