If you can use node&#39;s built in [`child_process.spawn`](http://nodejs.org/api/child_process.html#child_process_child_process_spawn_command_args_options), you&#39;re able to send a `SIGINT` signal to the child process:

    var proc = require(&#39;child_process&#39;).spawn(&#39;mongod&#39;);
    proc.kill(&#39;SIGINT&#39;);

An upside to this is that the main process should hang around until all of the child processes have terminated.

How can I combine passport-local to return a JWT token on successful authentication?

I want to use [node-jwt-simple][1] and looking at [passport.js][2] I am not sure how to go about.

    var passport = require(&#39;passport&#39;)
      , LocalStrategy = require(&#39;passport-local&#39;).Strategy;
    
    passport.use(new LocalStrategy(
      function(username, password, done) {
        User.findOne({ username: username }, function(err, user) {
          if (err) { return done(err); }
          if (!user) {
            return done(null, false, { message: &#39;Incorrect username.&#39; });
          }
          if (!user.validPassword(password)) {
            return done(null, false, { message: &#39;Incorrect password.&#39; });
          }
          return done(null, user);
        });
      }
    ));


Is it possible to return the token when calling done() ?
Something like this... (just pseudo code)

    if(User.validCredentials(username, password)) {
      var token = jwt.encode({username: username}, tokenSecret);
      done(null, {token : token}); //is this possible?
    }

If not, how can I return the token?


  [1]: https://github.com/hokaccha/node-jwt-simple
  [2]: http://passportjs.org/guide/username-password/

passport-local with node-jwt-simple

I wanna use the google&#39;s volley library 

I am using Android Studio and I know how to add .jar libraries.

But I could not create a .jar library with the volley files:

&gt; https://android.googlesource.com/platform/frameworks/volley

Here what I did: (using windows seven)

    git clone https://android.googlesource.com/platform/frameworks/volley
    cd volley
    android.bat update project -p . --target android-19
    ant.jar jar

And I get the output:

&gt; A java exception has occured.

what is wrong? how can i add a not .jar library?


Import Android volley to Android Studio

Created a childprocess using shelljs

  
    !/usr/bin/env node
    
    require(&#39;/usr/local/lib/node_modules/shelljs/global&#39;);
       fs = require(&quot;fs&quot;);  
       var child=exec(&quot;sudo mongod &amp;&quot;,{async:true,silent:true});
          
       function on_exit(){
        	console.log(&#39;Process Exit&#39;);
        	child.kill(&quot;SIGINT&quot;);
        	process.exit(0)
        }
      
        process.on(&#39;SIGINT&#39;,on_exit);
        process.on(&#39;exit&#39;,on_exit);
        


Child process is still running .. after kill the parent process


How to kill childprocess in nodejs?

Created a childprocess using shelljs
<pre><code class="hljs language-javascript">!/usr/bin/env node

require('/usr/local/lib/node_modules/shelljs/global');
 fs = require("fs"); 
 var child=exec("sudo mongod &#x26;",{async:true,silent:true});
 
 function on_exit(){
 	console.log('Process Exit');
 	child.kill("SIGINT");
 	process.exit(0)
 }
 
 process.on('SIGINT',on_exit);
 process.on('exit',on_exit);
 
</code></pre>
Child process is still running .. after kill the parent process

Yes, I know. There is no folder concept on s3 storage. but I really want to delete a specific folder from s3 with node.js. I tried two solutions, but both didn&#39;t work.
My code is below:
Solution 1:
Deleting folder directly.

    var key=&#39;level/folder1/folder2/&#39;;
    var strReturn;
			var params = {Bucket: MyBucket};
			var s3 = new AWS.S3(params);
			s3.client.listObjects({
		        Bucket: MyBucket,
		        Key: key
		    }, function (err, data) {
		    	if(err){
		    		strReturn=&quot;{\&quot;status\&quot;:\&quot;1\&quot;}&quot;;
		    		
		    	}else{
		    		strReturn=+&quot;{\&quot;status\&quot;:\&quot;0\&quot;}&quot;;
		    	}
		    	res.send(returnJson);
		    	console.log(&#39;error:&#39;+err+&#39; data:&#39;+JSON.stringify(data));
		    });
Actually, I have a lot of files under folder2. I can delete single file from folder2 if I define key like this:
var key=&#39;level/folder1/folder2/file1.txt&#39;, but it didn&#39;t work when I deleted a folder(key=&#39;level/folder1/folder2/&#39;).
Solution 2:
I tried to set expiration to an object when I uploaded this file or folder to s3. code is below:

    s3.client.putObject({
			        Bucket: Camera_Bucket,
			        Key: key,
                                ACL:&#39;public-read&#39;, 
			        Expires: 60 
			    }

But it didn&#39;t either. After finishing uploading, I checked the properties of that file. it showed there was nothing value for expiry date:

    Expiry Date:none
    Expiration Rule:N/A

How can I delete folder on s3 with node.js?


How can I delete folder on s3 with node.js?

when I use node mysql, an error is appear between 12:00 to 2:00 that the TCP connection is shutdown by the server. This is the full message:

    Error: Connection lost: The server closed the connection.
    at Protocol.end (/opt/node-v0.10.20-linux-x64/IM/node_modules/mysql/lib/protocol/Protocol.js:73:13)
    at Socket.onend (stream.js:79:10)
    at Socket.EventEmitter.emit (events.js:117:20)
    at _stream_readable.js:920:16
    at process._tickCallback (node.js:415:13)

There is the [solution][1]. However, after I try by this way, the problem also appear. now I do not know how to do. Does anyone meet this problem?

Here is the way I wrote follow the solution:

        var handleKFDisconnect = function() {
        kfdb.on(&#39;error&#39;, function(err) {
            if (!err.fatal) {
                return;
            }
            if (err.code !== &#39;PROTOCOL_CONNECTION_LOST&#39;) {
                console.log(&quot;PROTOCOL_CONNECTION_LOST&quot;);
                throw err;
            }
            log.error(&quot;The database is error:&quot; + err.stack);
    
            kfdb = mysql.createConnection(kf_config);
    
            console.log(&quot;kfid&quot;);
    
            console.log(kfdb);
            handleKFDisconnect();
        });
       };
       handleKFDisconnect();

  [1]: https://github.com/felixge/node-mysql#server-disconnects

nodejs mysql Error: Connection lost The server closed the connection

I was wondering what the best approach is for configuring a module export. &quot;async.function&quot; in the example below could be a FS or HTTP request, simplified for the sake of the example:

Here&#39;s example code (asynmodule.js):

    var foo = &quot;bar&quot;
    async.function(function(response) {
      foo = &quot;foobar&quot;;
      // module.exports = foo;  // having the export here breaks the app: foo is always undefined.
    });

    // having the export here results in working code, but without the variable being set.
    module.exports = foo;

How can I export the module only once the async callback has been executed? 

*edit* 
a quick note on my actual use-case: I&#39;m writing a module to configure nconf (https://github.com/flatiron/nconf) in an fs.exists() callback (i.e. it will parse a config file and set up nconf). 

Asynchronous nodejs module exports

I&#39;m use [mikeal/request](https://github.com/mikeal/request) to make API calls. One of the API&#39;s I use most frequently (the Shopify API). Recently put out a new [call limit](http://docs.shopify.com/api/tutorials/learning-to-respect-the-api-call-limit), I&#39;m seeing errors like: 


    Exceeded 6.0 calls per second for api client. Slow your requests or contact support for higher limits.


I&#39;ve already gotten an upgrade, but regardless of how much bandwidth I get I have to account for this. A large majority of the requests to the Shopify API are within [async.map()](https://github.com/caolan/async) functions, which loop asynchronous requests, and gather the bodies.

I&#39;m looking for any help, perhaps a library that already exists, that would wrap around the request module and actually block, sleep, throttle, allocate, manage, the many simultaneous requests that are firing off asynchronously and limit them to say `6` requests at a time. I have no problem with working on such a project if it doesn&#39;t exist. I just don&#39;t know how to handle this kind of situation, and I&#39;m hoping for some kind of standard.

I made a ticket with [mikeal/request](https://github.com/mikeal/request/issues/716).

Throttle and queue up API requests due to per second cap

Its must be a popular question but I could not find an answer.

How to move all files via * including hidden files as well to parent directory like this:

    mv /path/subfolder/* /path/

This will move all files to parent directory like expected but will not move hidden files. How to do that?



How to move all files including hidden files into parent directory via *

I&#39;ve a file with a sequence of JSON element:

    { element0: &quot;lorem&quot;, value0: &quot;ipsum&quot; }
    { element1: &quot;lorem&quot;, value0: &quot;ipsum&quot; }
    ...
    { elementN: &quot;lorem&quot;, value0: &quot;ipsum&quot; }

Is there a shell script to format JSON to display file content in a readable form? 

I&#39;ve seen [this][1] post, and I think is a good starting point!

My idea is to iterate rows in the file and then: 

    while read row; do echo ${row} | python -mjson.tool; done &lt; &quot;file_name&quot;

Does anyone have any other ideas?

  [1]: https://stackoverflow.com/questions/352098/how-can-i-pretty-print-json-from-the-command-line

How can I pretty-print a JSON file from the command line?

How can I highlight the Bash/shell commands in Markdown files?

---

For example, to highlight `js`, I write:

&lt;!-- language: lang-none --&gt;

    ```js
    function () { return &quot;This code is highlighted as Javascript!&quot;}
    ```

To highlight HTML code I use ` ```html `.

How can we highlight Bash/shell commands?





Highlight Bash/shell code in Markdown files

Now I want to find whether there are lines containing &#39;\&#39; character. I tried `grep &quot;\\&quot; XXFile` but it hints &quot;Trailing Backslash&quot;. But when I tried `grep &#39;\\&#39; XXFile` it is OK. Could anyone explain why the first case cannot run? Thanks.

When grep &quot;\\&quot; XXFile I got &quot;Trailing Backslash&quot;

[GitHub guide](https://help.github.com/articles/downloading-files-from-the-command-line) explains 2 way to authorize but looks neither of those works with the Release files.

as a result of:

```sh
curl -u &#39;username&#39; -L -o a.tgz https://github.com/company/repository/releases/download/TAG-NAME/A.tgz
``` 

There always is something like

```html
&lt;!DOCTYPE html&gt;
&lt;!--
Hello future GitHubber! ...
```

How to download GitHub Release from private repo using command line

I&#39;m running a Python script through a child process in Node.js, like this:

    require(&#39;child_process&#39;).exec(&#39;python celulas.py&#39;, function (error, stdout, stderr) {
    	child.stdout.pipe(process.stdout);
    });

but Node doesn&#39;t wait for it to finish. How can I wait for the process to finish?

Is it possible to do this by running the child process in a module I call from the main script?

How to wait for a child process to finish in Node.js

## When I get the following error:

    events.js:72
            throw er; // Unhandled &#39;error&#39; event
                  ^
    Error: spawn ENOENT
        at errnoException (child_process.js:1000:11)
        at Process.ChildProcess._handle.onexit (child_process.js:791:34)

## What procedure can I follow to fix it?

**Author note**: Lots of issues with this error encouraged me to post this question for future references.

**Related questions:**

- https://stackoverflow.com/questions/20825157/using-spawn-function-with-node-env-production
- https://stackoverflow.com/questions/24496015/node-js-child-process-spawn-enoent-error-only-under-supervisord
- https://stackoverflow.com/questions/25090140/spawn-enoent-node-js-error
- https://stackoverflow.com/questions/27603713/nodejs-spawn-enoent-error-on-travis-calling-global-npm-package
- https://stackoverflow.com/questions/20156067/node-js-child-process-spawnnpm-install-in-grunt-task-results-in-enoent-err
- https://stackoverflow.com/questions/24366113/running-foreman-task-fatal-error-spawn-enoent/27689089#27689089
- https://stackoverflow.com/questions/26624302/unhandled-error-event-in-node-js-error-spawn-enoent-at-errnoexception-child-pr/27689141#27689141
- https://stackoverflow.com/questions/21379677/node-js-spookyjs-error-executing-hello-js
- https://stackoverflow.com/questions/26572214/run-grunt-on-a-directory-nodewebkit
- https://stackoverflow.com/questions/23764429/run-exe-file-with-child-process-nodejs
- https://stackoverflow.com/questions/24717446/node-child-process-spawn-not-working-on-java-even-though-its-in-the-path-enoe
- https://stackoverflow.com/questions/26232590/spawn-enoent-error-with-nodejs (PYTHON related)
- https://stackoverflow.com/questions/21346717/image-resizing-is-not-working-in-node-js-partial-js (non-installed dependency)
- https://stackoverflow.com/questions/25924494/npm-install-error-enoent (build dependency problem)
- https://stackoverflow.com/questions/27393631/cannot-install-node-js-oracle-module-on-windows-7 (build dependency problem)
- https://stackoverflow.com/questions/26699999/error-installing-gulp-using-nodejs-on-windows (strange case)


How do I debug &quot;Error: spawn ENOENT&quot; on node.js?

I&#39;d like to use the `execSync` method which was added in NodeJS 0.12 but still have the output in the console window from which i ran the Node script.

E.g. if I run a NodeJS script which has the following line I&#39;d like to see the full output of the rsync command &quot;live&quot; inside the console:

    require(&#39;child_process&#39;).execSync(&#39;rsync -avAXz --info=progress2 &quot;/src&quot; &quot;/dest&quot;&#39;);

I understand that `execSync` returns the ouput of the command and that I could print that to the console after execution but this way I don&#39;t have &quot;live&quot; output...

Use child_process.execSync but keep output in console

When spawning child processes via `spawn()/exec()/...` in Node.js, there is a `&#39;close&#39;` and an `&#39;exit&#39;` event on child processes.

What is the difference between those two and when do you need to use what?

Difference between ChildProcess close, exit events

I have a C program that compiles to an executable called myprogram. This is its main function:

    int main(int argc, char ** argv) {
	  printf(&quot;this is a test message.\n&quot;);
	  system(&quot;ls&quot;);
    
      return 0;
    }

When I run `myprogram &gt; output.txt` in a Linux shell and then examine output.txt, I see the output of `ls` listed above &quot;this is a test message.&quot; 

I feel like it should be the other way around. Why is this happening, and what can I do so that &quot;this is a test message&quot; appears at the top of output.txt?  

If it matters, I&#39;m new to both C and working in a command line.

Content Type	Original Author	Original Content on Stackoverflow
Question	Deepak Patil	View Question on Stackoverflow
Solution 1 - node.js	Michael Tang	View Answer on Stackoverflow

How to kill childprocess in nodejs?

node.js Problem Overview

node.js Solutions

Solution 1 - node.js

Import Android volley to Android Studio

passport-local with node-jwt-simple

Attributions