Node JS Ongoing Shell Output

Question

I'd like to have Node parse output from an ongoing bash command and do things with it in parallel to the execution of the executed command.

For example,

const { exec } = require('child_process');

const child = exec('bash server.sh',
  (error, stdout, stderr) => {
    console.log(`stdout: ${stdout}`);
    console.log(`stderr: ${stderr}`);
    if (error !== null) {
      console.log(`exec error: ${error}`);
    }
  });

where server.sh is

yell () {
  echo "bing";
  sleep 1s;
  yell;
}

yell;

The process unfortunately hangs as the execution is waiting for server.sh to finish but it never does. Is there a way to process the output of server.sh as it appears?

Seems to me you have to do something about child to make this execute in the first place. — Samuel_NET
– Samuel_NET, Commented Oct 28, 2019 at 14:24
Correct, looks like I can add an event listener like so: ``` child.stdout.on('data', (data) => { console.log(data.toString()); }); ``` — Coley G
– Coley G, Commented Oct 28, 2019 at 14:29

Coley G · Accepted Answer · 2019-10-28 14:30:08Z

1

An event listener can be bound like so:

child.stdout.on('data', (data) => {
  console.log(data.toString());
});

answered Oct 28, 2019 at 14:30

Coley G

631 silver badge8 bronze badges

Sign up to request clarification or add additional context in comments.

Collectives™ on Stack Overflow

Node JS Ongoing Shell Output

1 Answer 1

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

Comments

Your Answer

Sign up or log in

Post as a guest

Related