Chain shell commands in Node.js

Question

I need to kextunload driver.kext && kextload driver.kext.

I always use child_proces spawn function but don't know how to chain with it.

Here's an example of how I use it

var spawn = require('child_process').spawn
spawn('afplay', ['fanfare.mp3', '-t', '6']);

nodejs.org/api/child_process.html There are synchronous methods at the bottom. — David Zech
– David Zech, Commented Aug 28, 2015 at 17:09

mscdex · Accepted Answer · 2015-08-28 17:13:12Z

2

If you don't need the streaming capabilities of spawn(), you could just easily use exec() instead, like:

var exec = require('child_process').exec;
exec('kextunload driver.kext && kextload driver.kext', function(err, stdout, stderr) {
  // ...
});

answered Aug 28, 2015 at 17:13

mscdex

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4 Comments

Jan Jůna Over a year ago

And if he do need streaming? :-P

mscdex Over a year ago

@JanJůna Then use spawn()? For programs/commands like 'kextload'/'kextunload', there really isn't any need to stream the output.

Jan Jůna Over a year ago

For other commands, it can be important to stream output instead of buffering it into memory (which can result in Max buffer size error). I found out that Node v6 has new option parameter shell: true/false which will run whole command so you can just call let spawnProcess = spawn("ls && ls && ls", {shell: true}) and it will work.

mscdex Over a year ago

@JanJůna Right, you could use that config option for node v6+.

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