Send user input from NodeJS to shell script

Question

I have this NodeJS script:

var util  = require('util'),
process = require('child_process'),
ls    = process.exec('test.sh');

ls.stdout.on('data', function (data) {
   console.log(data.toString());
   ls.stdin.write('Test');
});

and this shell script:

#!/bin/bash
echo "Please input your name:";
read name;                 
echo "Your name is $name";

I tried to run the NodeJS script and it stucked at "Please input your name:". Does anyone know how to send an input from NodeJS script to the shell script ?

Thanks

Jason Aller · Accepted Answer · 2018-03-09 16:08:57Z

5

You will have to say something like this:

ls.stdin.write('test\n');

OR

you can inherit standard streams if you want input from user using spawn.

like this:

var spawn = require('child_process').spawn;
spawn('sh',['test.sh'], { stdio: 'inherit' });

edited Mar 9, 2018 at 16:08

Jason Aller

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answered Jun 25, 2014 at 13:41

Mritunjay

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2 Comments

Saksham Khurana Over a year ago

cannot stress enough how thankful I am because of your response of 'inherit'... Thanks a lot

Silas Over a year ago

This answer with the stdio inheritance saved me from a 3 days headache, thank you!!

mscdex · Accepted Answer · 2014-06-25 13:40:29Z

3

Did you try adding '\n' to the end of your input (e.g. ls.stdin.write('Test\n');) to simulate pressing return/enter?

Also, you want process.spawn, not process.exec. The latter does not have a streaming interface like you are using, but it instead executes the command and buffers stdout and stderr output (passing it to the callback given to process.exec()).

answered Jun 25, 2014 at 13:40

mscdex

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