Piping shell script through bash using node.js

Question

Say I have this:

const cp = require('child_process');

fs.createReadStream(__dirname + '/dummy.sh')
  .pipe(cp.spawn('bash').stdin).on('data', d => {
  console.log('data:', d);
});

and dummy.sh constains just echo "this is dummy" , for whatever reason no data comes through in the on data callback. Does anyone know why that might be? I would expect this output data: this is dummy

Answer 1

You are not listening for the output of your bash command.
The on('data') event handler doesn't trigger your bash script output.

Instead, you should listen to the process stdout :

const fs = require('fs');
const cp = require('child_process');

let cmd = cp.spawn('bash');
fs.createReadStream(__dirname + '/dummy.sh')
    .pipe(cmd.stdin).pipe(cmd.stdout).on('data', d => {
  console.log('data:', d.toString());  // data: this is dummy
});