CODEWITHSUNDEEP
node.jsstream
closure
closure

Reputation: 123

nodejs stream no output

I am new to nodejs stream. I try to connect the child process stream with the parent's, but it doesn't work. Can someone tell me what's wrong with the code? here is my code.

var child = require('child_process');
var ps = child.spawn('wc', '-l');

ps.stdout.pipe(process.stdout, {end: false});
process.stdin.pipe(ps.stdin, {end:false});

ps.stdin.on('end', function(){
    process.stdout.write('ps stream ended');
});

ps.on('exit', function(code){
    process.exit(code);
});

Upvotes: 2

Views: 159

Answers (1)

Antonio Narkevich
Antonio Narkevich

Reputation: 4336

There are 2 things with this code. First, the second argument of .spawn should be an array. Second, you basically need to pass a filename to wc to get any output.

So for example if you do something like

var ps = child.spawn('wc', ['-l', 'package.json']);

or

var ps = child.spawn('ls', ['-a']);

It works just fine.

Upvotes: 1

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