    console.log(&#39;Terminal size: &#39; + process.stdout.columns + &#39;x&#39; + process.stdout.rows);

And the output looks like e.g. &quot;Terminal size: 80x24&quot;. There is also an event if the console size changes.

It&#39;s explained under [tty][1] in the docs.


  [1]: https://nodejs.org/api/tty.html

My code is:

    #include &lt;stdio.h&gt;
    #include &lt;string.h&gt;

    void main()
        {
	    char string[10];
	    int A = -73;
	    unsigned int B = 31337;

	    strcpy(string, &quot;sample&quot;);

	    // printing with different formats
	    printf(&quot;[A] Dec: %d, Hex: %x, Unsigned: %u\n&quot;, A,A,A);
	    printf(&quot;[B] Dec: %d, Hex: %x, Unsigned: %u\n&quot;, B,B,B);
	    printf(&quot;[field width on B] 3: &#39;%3u&#39;, 10: &#39;%10u&#39;, &#39;%08u&#39;\n&quot;, B,B,B);

	    // Example of unary address operator (dereferencing) and a %x
        // format string 
	    printf(&quot;variable A is at address: %08x\n&quot;, &amp;A);

I am using the terminal in linux mint to compile, and when I try to compile using gcc I get the following error message:

    basicStringFormatting.c: In function ‘main’:
    basicStringFormatting.c:18:2: warning: format ‘%x’ expects argument
    of type ‘unsigned int’, but argument 2 has type ‘int *’ [-Wformat=]
    printf(&quot;variable A is at address: %08x\n&quot;, &amp;A);

All I am trying to do is print the address in memory of the variable A.


How to printf a memory address in C

I have a script that generates two-dimensional `numpy` arrays with `dtype=float` and shape on the order of `(1e3, 1e6)`.  Right now I&#39;m using `np.save` and `np.load` to perform IO operations with the arrays.  However, these functions take several seconds for each array.  Are there faster methods for saving and loading the entire arrays (i.e., without making assumptions about their contents and reducing them)?  I&#39;m open to converting the arrays to another type before saving as long as the data are retained exactly.

Fastest save and load options for a numpy array

    console.log(process.env.COLUMNS)

Yields `undefined`, although,

    $ echo $COLUMNS

Outputs as expected:

    78

I have been trying running Node like this `env node myprog.js`, still `undefined`. What&#39;s wrong with me or any other way to know the width of terminal? (For nice formatting of some output data).


Get width of terminal in Node.js

<pre><code class="hljs language-arduino">console.log(process.env.COLUMNS)
</code></pre>
Yields <code>undefined</code>, although,
<pre><code class="hljs language-shell">$ echo $COLUMNS
</code></pre>
Outputs as expected:
<pre><code class="hljs">78
</code></pre>
I have been trying running Node like this <code>env node myprog.js</code>, still <code>undefined</code>. What's wrong with me or any other way to know the width of terminal? (For nice formatting of some output data).

This works:

    import app from &#39;./../app.js&#39;;

But this doesn&#39;t:

    import app from path.join(process.cwd(), &#39;app&#39;);

I&#39;m Getting:

    SyntaxError: /path/file.js: Unexpected token (5:16)
    &gt; 5 | import app from path.join(process.cwd(), &#39;app&#39;);
        |                 ^


It is possible (and/or how) to use &quot;dynamic&quot; paths? (not hardcoding the path or rely in relative paths).

Importing modules using ES6 syntax and dynamic path

I&#39;m attempting to load an RSA private key into my nodejs application using environment variables, but the newlines seem to be being auto-escaped.

For the following, assume that the ```PRIVATE_KEY``` env var is set to the following (not my actual key):

    PRIVATE_KEY=&quot;-----BEGIN RSA PRIVATE KEY-----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\n37sJ5QsW+sJyoNde3xH8vdXhzU7eT82D6X/scw9RZz+/6rCJ4p0=\n-----END RSA PRIVATE KEY-----&quot;

If I call ```console.log``` directly with the preceding string, I get the following as output:

    -----BEGIN RSA PRIVATE KEY-----
    MIICXAIBAAKBgQCqGKukO1De7zhZj6+H0qtjTkVxwTCpvKe4eCZ0FPqri0cb2JZfXJ/DgYSF6vUp
    wmJG8wVQZKjeGcjDOL5UlsuusFncCzWBQ7RKNUSesmQRMSGkVb1/3j+skZ6UtW+5u09lHNsj6tQ5
    1s1SPrCBkedbNf0Tp0GbMJDyR4e9T04ZZwIDAQABAoGAFijko56+qGyN8M0RVyaRAXz++xTqHBLh
    3tx4VgMtrQ+WEgCjhoTwo23KMBAuJGSYnRmoBZM3lMfTKevIkAidPExvYCdm5dYq3XToLkkLv5L2
    pIIVOFMDG+KESnAFV7l2c+cnzRMW0+b6f8mR1CJzZuxVLL6Q02fvLi55/mbSYxECQQDeAw6fiIQX
    GukBI4eMZZt4nscy2o12KyYner3VpoeE+Np2q+Z3pvAMd/aNzQ/W9WaI+NRfcxUJrmfPwIGm63il
    AkEAxCL5HQb2bQr4ByorcMWm/hEP2MZzROV73yF41hPsRC9m66KrheO9HPTJuo3/9s5p+sqGxOlF
    L0NDt4SkosjgGwJAFklyR1uZ/wPJjj611cdBcztlPdqoxssQGnh85BzCj/u3WqBpE2vjvyyvyI5k
    X6zk7S0ljKtt2jny2+00VsBerQJBAJGC1Mg5Oydo5NwD6BiROrPxGo2bpTbu/fhrT8ebHkTz2epl
    U9VQQSQzY1oZMVX8i1m5WUTLPz2yLJIBQVdXqhMCQBGoiuSoSjafUhV7i1cEGpb88h5NBYZzWXGZ
    37sJ5QsW+sJyoNde3xH8vdXhzU7eT82D6X/scw9RZz+/6rCJ4p0=
    -----END RSA PRIVATE KEY-----

You can see that the newline chars are being respected. However, if I call ```console.log(process.env[&quot;PRIVATE_KEY&quot;])```, the output contains the `\n` literal instead of actual newlines:

    -----BEGIN RSA PRIVATE KEY-----\nMIICXAIBAAKBgQCqGKukO1De7zhZj6+H0qtjTkVxwTCpvKe4eCZ0FPqri0cb2JZfXJ/DgYSF6vUp\nwmJG8wVQZKjeGcjDOL5UlsuusFncCzWBQ7RKNUSesmQRMSGkVb1/3j+skZ6UtW+5u09lHNsj6tQ5\n1s1SPrCBkedbNf0Tp0GbMJDyR4e9T04ZZwIDAQABAoGAFijko56+qGyN8M0RVyaRAXz++xTqHBLh\n3tx4VgMtrQ+WEgCjhoTwo23KMBAuJGSYnRmoBZM3lMfTKevIkAidPExvYCdm5dYq3XToLkkLv5L2\npIIVOFMDG+KESnAFV7l2c+cnzRMW0+b6f8mR1CJzZuxVLL6Q02fvLi55/mbSYxECQQDeAw6fiIQX\nGukBI4eMZZt4nscy2o12KyYner3VpoeE+Np2q+Z3pvAMd/aNzQ/W9WaI+NRfcxUJrmfPwIGm63il\nAkEAxCL5HQb2bQr4ByorcMWm/hEP2MZzROV73yF41hPsRC9m66KrheO9HPTJuo3/9s5p+sqGxOlF\nL0NDt4SkosjgGwJAFklyR1uZ/wPJjj611cdBcztlPdqoxssQGnh85BzCj/u3WqBpE2vjvyyvyI5k\nX6zk7S0ljKtt2jny2+00VsBerQJBAJGC1Mg5Oydo5NwD6BiROrPxGo2bpTbu/fhrT8ebHkTz2epl\nU9VQQSQzY1oZMVX8i1m5WUTLPz2yLJIBQVdXqhMCQBGoiuSoSjafUhV7i1cEGpb88h5NBYZzWXGZ\n37sJ5QsW+sJyoNde3xH8vdXhzU7eT82D6X/scw9RZz+/6rCJ4p0=\n-----END RSA PRIVATE KEY-----

I&#39;ve been trying to find more information online about how node processes environment variables with no luck. How do I load this key via env vars while maintaining newline characters? If that&#39;s not possible, how can I restore them?

Environment variables containing newlines in Node?

I have an issue I&#39;ve not seen before with the Mongoose findByIdAndUpdate not returning the correct model in the callback.

Here&#39;s the code:

        var id = args._id;
        var updateObj = {updatedDate: Date.now()};
        _.extend(updateObj, args);

        Model.findByIdAndUpdate(id, updateObj, function(err, model) {
            if (err) {
                logger.error(modelString +&#39;:edit&#39; + modelString +&#39; - &#39; + err.message);
                self.emit(&#39;item:failure&#39;, &#39;Failed to edit &#39; + modelString);
                return;
            }
            self.emit(&#39;item:success&#39;, model);
        });

The original document in the db looks like this:

    {
        _id: 1234
        descriptors: Array[2],
        name: &#39;Test Name 1&#39;
    }

The updateObj going in looks like this:

    {
        _id: 1234
        descriptors: Array[2],
        name: &#39;Test Name 2&#39;
    }  

The model returned from the callback is identical to the original model, not the updatedObj.
If I query the db, it has been updated correctly.  It&#39;s just not being returned from the database.

This feels like a &#39;stupid-user&#39; error, but I can&#39;t see it.  Any ideas greatly appreciated. 

Mongoose findByIdAndUpdate not returning correct model

After learning about [Observables](https://github.com/jhusain/asyncgenerator), I find them quite similar to [Node.js streams][1]. Both have a mechanism of notifying the consumer whenever new data arrives, an error occurs or there is no more data (EOF).

I would love to learn about the conceptual/functional differences between the two. Thanks!


  [1]: https://nodejs.org/api/stream.html

Node.js Streams vs. Observables

I&#39;m writing a program in Node.js that (in some situations) wants to act as a simple filter: read everything from stdin (up to end of file), do some processing, write the result to stdout.

How do you do the &#39;read everything from stdin&#39; part? The closest solutions I&#39;ve found so far, seem to work either for one line at a time from the console, or else only work when stdin is a file not a pipe.

Read all text from stdin to a string

I am trying to edit an entry to PATH, as I did something wrong.

I am using [Mac&amp;nbsp;OS&amp;nbsp;X v10.10.3][1] (Yosemite)

I have tried:

    touch ~/.bash_profile; open ~/.bash_profile

But the file editor opens with nothing inside.

My problem:

I am trying to install ANDROID_HOME to my PATH

I misspelled it, but when I closed the terminal and went back it was gone, so I tried again:

&gt;     export ANDROID_HOME=/&lt;installation location&gt;/android-sdk-macosx
&gt;     export PATH=${PATH}:$ANDROID_HOME/tools:$ANDROID_HOME/platform-tools

This time, I typed the command correctly but, when I closed the terminal, my settings disappeared again.

How do I execute my desired settings?

If I was to edit bash.profile, how would I enter the above code?

  [1]: https://en.wikipedia.org/wiki/OS_X_Yosemite

 

How do I edit $PATH (.bash_profile) on OS X?

I just created a new Swift project within Xcode. I am wondering which version of Swift it&#39;s using. 

How can I see, in Xcode or the terminal, what version of Swift I am using inside my project?


How do I see which version of Swift I&#39;m using?

I removed cocoa pods because it claimed it had installed, but kept saying the command pod wasn&#39;t found afterward. When trying to reinstall cocoapods (`sudo gem install cocoa pods -v`) I get this error:

&gt; ERROR:  While executing gem ... (Errno::EPERM)
&gt;     Operation not permitted - /usr/bin/pod

[![Screenshot for error][1]][1]

Any ideas?


  [1]: http://i.stack.imgur.com/xDNoa.png

Cannot install cocoa pods after uninstalling, results in error

Usually on a Unix/Linux terminal when you press &lt;kbd&gt;Tab&lt;/kbd&gt; it will auto-complete until there are several options, and then it will list the options below for you to select. For example:

    cd he
    helpFolder/ helpMe/ heIsThere/
    cd help

With the Mac terminal, it forces you to press it twice to see options. I wondering if it&#39;s possible to change that setting to one &lt;kbd&gt;Tab&lt;/kbd&gt; press?

Mac Terminal Auto Complete

I want to install the MySQL client for the command line, not a GUI. I have searched over the web but only found instructions on installing the MySQL server.

Content Type	Original Author	Original Content on Stackoverflow
Question	exebook	View Question on Stackoverflow
Solution 1 - node.js	r0-	View Answer on Stackoverflow

Get width of terminal in Node.js

node.js Problem Overview

node.js Solutions

Solution 1 - node.js

Fastest save and load options for a numpy array

How to printf a memory address in C

Attributions