I would like to
C:\>ACommandThatGetsData > save.txt
But instead of parsing and saving the data in the console, I would like to do the above command with Node.JS
How to execute a shell command with Node.JS?
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possible duplicate of node.js shell command executionMike Pennington– Mike Pennington2013-04-10 07:48:56 +00:00Commented Apr 10, 2013 at 7:48
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Possible duplicate of Get the output of a shell command in node.jsDamjan Pavlica– Damjan Pavlica2018-07-17 12:55:41 +00:00Commented Jul 17, 2018 at 12:55
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3 Answers
Use process.execPath():
process.execPath('/path/to/executable');
Update
I should have read the documentations better.
There is a Child Process Module which allows to execute a child process. You will need either child_process.exec, child_process.execFile or child_process.spawn. All of these are similar in use, but each has its own advantages. Which of them to use depends on your needs.
Comments
You could also try the node-cmd package:
const nodeCmd = require('node-cmd');
nodeCmd.get('dir', (err, data, stderr) => console.log(data));
On newer versions of the package, the syntax changed a little:
const nodeCmd = require('node-cmd');
nodeCmd.run('dir', (err, data, stderr) => console.log(data));
It does not support Promises directly, but you can easily wrap them inside one:
const nodeCmd = require('node-cmd');
const promise = new Promise((resolve, reject) => {
nodeCmd.run('dir', (err, data, stderr) => {
if (err) {
reject(err);
} else {
resolve(data, stderr);
}
});
});
5 Comments
Adam Marsh
This resolved the brick wall I was hitting! Thanks :)
AmirHossein Rezaei
get function is not defined in newer version. New exmaple can be found here npmjs.com/package/node-cmd
Devanand Sharma
The node-cmd module internally uses child_process only => (github.com/RIAEvangelist/node-cmd)
C.Unbay
can i use this with
awaitand promises ? Thank you
Haroldo_OK
Not sure if if supports Promised directly, but even if it doesn't, you can always wrap it inside a promise; if
err is non-falsy, you would call reject(err); otherwise, you'd call resolve(data). Please see developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/… in order to see how to use resolve and reject to implement a Promise.I know this question is old, but it helped me get to my solution using promises. Also see: this question & answer
const util = require('util');
const exec = util.promisify(require('child_process').exec);
async function runCommand(command) {
const { stdout, stderr, error } = await exec(command);
if(stderr){console.error('stderr:', stderr);}
if(error){console.error('error:', error);}
return stdout;
}
async function myFunction () {
// your code here building the command you wish to execute ...
const command = 'dir';
const result = await runCommand(command);
console.log("_result", result);
// your code here processing the result ...
}
// just calling myFunction() here so it runs when the file is loaded
myFunction();
