Run PowerShell as an administrator (to get the necessary registry access permissions) then call out to the .Net framework to set it:

    [Environment]::SetEnvironmentVariable(&quot;MyTestVariable&quot;, &quot;MyTestValue&quot;, &quot;Machine&quot;)

NB. it won&#39;t take effect within the same process, you&#39;ll have to make a new PowerShell process to see it.


Run PowerShell as an admin. Don&#39;t use this if you are trying to modify something like environmental extensions or environmental paths. No need to run refreshEnv and no need to open a new PowerShell window to see it



    $variableNameToAdd = &quot;mytestVariableName&quot;
    $variableValueToAdd = &quot;some environmental value to add&quot;
    [System.Environment]::SetEnvironmentVariable($variableNameToAdd, $variableValueToAdd, [System.EnvironmentVariableTarget]::Machine)
    [System.Environment]::SetEnvironmentVariable($variableNameToAdd, $variableValueToAdd, [System.EnvironmentVariableTarget]::Process)
    [System.Environment]::SetEnvironmentVariable($variableNameToAdd, $variableValueToAdd, [System.EnvironmentVariableTarget]::User)



You can find a cool explanation of this below,

[https://trevorsullivan.net/2016/07/25/powershell-environment-variables/][1]


  [1]: https://trevorsullivan.net/2016/07/25/powershell-environment-variables/

I&#39;m writing a WebSocket server where a web client connects to play chess against a multithreaded computer AI. The WebSocket server wants to pass a `Logger` object into the AI code. The `Logger` object is going to pipe down log lines from the AI to the web client. The `Logger` must contain a reference to the client connection.

I&#39;m confused about how lifetimes interact with threads. I&#39;ve reproduced the problem with a `Wrapper` struct parameterized by a type. The `run_thread` function tries to unwrap the value and log it.

```rs
use std::fmt::Debug;
use std::thread;

struct Wrapper&lt;T: Debug&gt; {
    val: T,
}

fn run_thread&lt;T: Debug&gt;(wrapper: Wrapper&lt;T&gt;) {
    let thr = thread::spawn(move || {
        println!(&quot;{:?}&quot;, wrapper.val);
    });

    thr.join();
}

fn main() {
    run_thread(Wrapper::&lt;i32&gt; { val: -1 });
}
```

The `wrapper` argument lives on the stack, and its lifetime doesn&#39;t extend past `run_thread`&#39;s stack frame, even though the thread will be joined before the stack frame ends. I&#39;d could copy the value off the stack:

```rs
use std::fmt::Debug;
use std::thread;

struct Wrapper&lt;T: Debug + Send&gt; {
    val: T,
}

fn run_thread&lt;T: Debug + Send + &#39;static&gt;(wrapper: Wrapper&lt;T&gt;) {
    let thr = thread::spawn(move || {
        println!(&quot;{:?}&quot;, wrapper.val);
    });

    thr.join();
}

fn main() {
    run_thread(Wrapper::&lt;i32&gt; { val: -1 });
}
```

This will not work if `T` is a reference to a big object I don&#39;t want copied:

```rs
use std::fmt::Debug;
use std::thread;

struct Wrapper&lt;T: Debug + Send&gt; {
    val: T,
}

fn run_thread&lt;T: Debug + Send + &#39;static&gt;(wrapper: Wrapper&lt;T&gt;) {
    let thr = thread::spawn(move || {
        println!(&quot;{:?}&quot;, wrapper.val);
    });

    thr.join();
}

fn main() {
    let mut v = Vec::new();
    for i in 0..1000 {
        v.push(i);
    }

    run_thread(Wrapper { val: &amp;v });
}
```

Which results in:

```none
error: `v` does not live long enough
  --&gt; src/main.rs:22:32
   |
22 |     run_thread(Wrapper { val: &amp;v });
   |                                ^ does not live long enough
23 | }
   | - borrowed value only lives until here
   |
   = note: borrowed value must be valid for the static lifetime...
```

The only solution I can think of is to use an `Arc`.

    use std::fmt::Debug;
    use std::sync::Arc;
    use std::thread;
    
    struct Wrapper&lt;T: Debug + Send + Sync + &#39;static&gt; {
        arc_val: Arc&lt;T&gt;,
    }
    
    fn run_thread&lt;T: Debug + Send + Sync + &#39;static&gt;(wrapper: &amp;Wrapper&lt;T&gt;) {
        let arc_val = wrapper.arc_val.clone();
        let thr = thread::spawn(move || {
            println!(&quot;{:?}&quot;, *arc_val);
        });
    
        thr.join();
    }
    
    fn main() {
        let mut v = Vec::new();
        for i in 0..1000 {
            v.push(i);
        }
    
        let w = Wrapper { arc_val: Arc::new(v) };
        run_thread(&amp;w);
    
        println!(&quot;{}&quot;, (*w.arc_val)[0]);
    }


In my real program, it appears that both the `Logger` and the connection object must be placed in `Arc` wrappers. It seems annoying that the client is required to box the connection in an `Arc` when it is internal to the library that the code is parallelized. This is especially annoying because the lifetime of the connection is guaranteed to be greater than the lifetime of the worker threads.

Have I missed something?

How can I pass a reference to a stack variable to a thread?

What is the actual difference between the GraphicsMagick and the ImageMagick libraries (source to compare list or article needed)?

What is actual difference between GraphicsMagick and ImageMagick?

I am Trying To add a System Variable here using PowerShell:

[![Environment Var dialog][1]][1]


  [1]: http://i.stack.imgur.com/l1kO5.jpg

I have tried both ways using 

    $env:MyTestVariable = &quot;My test variable.&quot;

and

    [Environment]::SetEnvironmentVariable(&quot;TestVariableName&quot;, &quot;My Value&quot;, &quot;&lt;option&gt;&quot;)

However neither of them seem to add to this section. I have tried restarting the  computer as well to see if it would take effect then. I have looked at technet along with countless other websites, but nothing I have tried has worked.

How can I set a system variable with PowerShell?

Powershell Add System Variable

I am Trying To add a System Variable here using PowerShell:
<a href="http://i.stack.imgur.com/l1kO5.jpg" target="_blank" rel="noopener noreferrer"><img src="http://i.stack.imgur.com/l1kO5.jpg" alt="Environment Var dialog"></a>
I have tried both ways using
<pre><code class="hljs language-ini">$env:MyTestVariable = "My test variable."
</code></pre>
and
<pre><code class="hljs language-css">[Environment]::SetEnvironmentVariable("TestVariableName", "My Value", "&#x3C;option>")
</code></pre>
However neither of them seem to add to this section. I have tried restarting the computer as well to see if it would take effect then. I have looked at technet along with countless other websites, but nothing I have tried has worked.
How can I set a system variable with PowerShell?

The code below is meant to generate a list of five pseudo-random numbers in the interval [1,100]. I seed the `default_random_engine` with `time(0)`, which returns the system time in [unix time](https://en.wikipedia.org/wiki/Unix_time). When I compile and run this program on Windows 7 using Microsoft Visual Studio 2013, it works as expected (see below). When I do so in Arch Linux with the g++ compiler, however, it behaves strangely.

In Linux, 5 numbers will be generated each time. The last 4 numbers will be different on each execution (as will often be the case), but the first number will stay the same.

Example output from 5 executions on Windows and Linux:

          | Windows:       | Linux:        
    ---------------------------------------
    Run 1 | 54,01,91,73,68 | 25,38,40,42,21
    Run 2 | 46,24,16,93,82 | 25,78,66,80,81
    Run 3 | 86,36,33,63,05 | 25,17,93,17,40
    Run 4 | 75,79,66,23,84 | 25,70,95,01,54
    Run 5 | 64,36,32,44,85 | 25,09,22,38,13

Adding to the mystery, that first number periodically increments by one on Linux. After obtaining the above outputs, I waited about 30 minutes and tried again to find that the 1st number had changed and now was always being generated as a 26. It has continued to increment by 1 periodically and is now at 32. It seems to correspond with the changing value of `time(0)`.

**Why does the first number rarely change across runs, and then when it does, increment by 1?**

The code. It neatly prints out the 5 numbers and the system time:

    #include &lt;iostream&gt;
    #include &lt;random&gt;
    #include &lt;time.h&gt;
    
    using namespace std;
    
    int main()
    {
    	const int upper_bound = 100;
        const int lower_bound = 1;
        
        time_t system_time = time(0);    
    
        default_random_engine e(system_time);
        uniform_int_distribution&lt;int&gt; u(lower_bound, upper_bound);
        
        cout &lt;&lt; &#39;#&#39; &lt;&lt; &#39;\t&#39; &lt;&lt; &quot;system time&quot; &lt;&lt; endl
    		 &lt;&lt; &quot;-------------------&quot; &lt;&lt; endl;
        
        for (int counter = 1; counter &lt;= 5; counter++)
        {
            int secret = u(e);
            cout &lt;&lt; secret &lt;&lt; &#39;\t&#39; &lt;&lt; system_time &lt;&lt; endl;
        }   
        
        system(&quot;pause&quot;);
        return 0;
    }

&lt;random&gt; generates same number in Linux, but not in Windows

I just developed my first program in C++ and I wanted to show it with one of my friends. Sadly, when he tries to open the exe it gets an error which says &quot;MSVCP140.dll is missing&quot;. Why is this issue happening and how can he/I fix it?

MSVCP140.dll missing

I&#39;m attempting to clone a repo from my BitBucket account to my Windows 10 laptop (running GitBash). I&#39;ve completed all of the steps necessary to connect (set up my SSH key, verified by successfully SSHing git@bitbucket.org, etc). However, whenever I attempt to clone a repo, the prompt continually hangs up after confirming that I want to cache Bitbucket&#39;s key.  

    User@Laptop MINGW64 /C/Repos
    $ git clone git@bitbucket.org:mygbid/test.git
    Cloning into &#39;test&#39;...
    The server&#39;s host key is not cached in the registry. You
    have no guarantee that the server is the computer you
    think it is.
    The server&#39;s rsa2 key fingerprint is:
    ssh-rsa 2048 97:8c:1b:f2:6f:14:6b:5c:3b:ec:aa:46:46:74:7c:40
    If you trust this host, enter &quot;y&quot; to add the key to
    PuTTY&#39;s cache and carry on connecting.
    If you want to carry on connecting just once, without
    adding the key to the cache, enter &quot;n&quot;.
    If you do not trust this host, press Return to abandon the
    connection.
    Store key in cache? (y/n) y

No files are cloned, and the result is an empty repo. Trying to initiate a git pull origin master from this repo also asks to cache the key, then hangs with no feedback. Despite not asking for the key to be cached when I do a test SSH, git operations always ask for the key every time before failing.

With no error messages to work with, I&#39;m really at a loss as to what is wrong. I&#39;ve tried multiple repos, including very small ones, with no success at all.

Git clone / pull continually freezing at &quot;Store key in cache?&quot;

I haven&#39;t seen anything about Windows compatibility -- is this on the way or currently available somewhere if I put forth some effort? (I have a Mac and an Ubuntu box but the Windows machine is the one with the discrete graphics card that I currently use with theano).


Is Tensorflow compatible with a Windows workflow?

I am trying to connect to SQL through python to run some queries on some SQL databases on Microsoft SQL server. From my research online and on this forum the most promising library seems to be pyodbc. So I have made the following code 

    import pyodbc
    conn = pyodbc.connect(init_string=&quot;driver={SQLOLEDB}; server=+ServerName+; 
    database=+MSQLDatabase+; trusted_connection=true&quot;)
    cursor = conn.cursor()

and get the following error

    Traceback (most recent call last):
      File &quot;C:\Users...\scrap.py&quot;, line 3, in &lt;module&gt;
        conn = pyodbc.connect(init_string=&quot;driver={SQLOLEDB}; server=+ServerName+; database=+MSQLDatabase+; trusted_connection=true&quot;)
    pyodbc.Error: (&#39;IM002&#39;, &#39;[IM002] [Microsoft][ODBC Driver Manager] Data source name not found and no default driver specified (0) (SQLDriverConnect)&#39;)

I have looked at the folowing posts and tried changing my driver to {sql server} and have connected using ODBC links before in SAS, which is partially what my above code is based on, so don&#39;t think I need to install anything else.

https://stackoverflow.com/questions/23900858/pyodbc-error-im002-im002-unixodbcdriver-managerdata-source-name-not

https://stackoverflow.com/questions/16280304/pyodbc-data-source-name-not-found-and-no-default-driver-specified

Thanks

Connecting to Microsoft SQL server using Python

I want to read a file line by line in PowerShell. Specifically, I want to loop through the file, store each line in a variable in the loop, and do some processing on the line.

I know the Bash equivalent:

    while read line do
        if [[ $line =~ $regex ]]; then
              # work here
        fi
    done &lt; file.txt

Not much documentation on PowerShell loops.


Read file line by line in PowerShell

I have a list of directories with numbers. I have to find the highest number and and increment it by 1 and create a new directory with that increment value. I am able to sort the below array, but I am not able to increment the last element as it is a string.

How do I convert this below array element to an integer?

    PS C:\Users\Suman\Desktop&gt; $FileList

    Name
    ----
    11
    2
    1


How to convert string to integer in PowerShell

I changed the colors of the powershell and now I can&#39;t change the color of the input text, is always **yellow**.

I changed the color of the background and the color of the text

![changing colors][1]

The color of the background changed correctly but in the display text the color still is yellow.

![changed][2]

Can I do something to reset the colors? 


  [1]: http://i.stack.imgur.com/xexGz.png
  [2]: http://i.stack.imgur.com/OjSr1.png

How can I reset the powershell colors

I&#39;m trying to extract text from a set of files on Windows using the Powershell (version 4):

    PS &gt; Select-String -AllMatches -Pattern &lt;mypattern-with(capture)&gt; -Path file.jsp | Format-Table

So far, so good. That gives a nice set of `MatchInfo` objects:

	IgnoreCase                    LineNumber Line                          Filename                      Pattern                       Matches
	----------                    ---------- ----                          --------                      -------                       -------
		True                            30   ...                           file.jsp                      ...                           {...}

Next, I see that the captures are in the matches member, so I take them out:

    PS &gt; Select-String -AllMatches -Pattern &lt;mypattern-with(capture)&gt; -Path file.jsp | ForEach-Object -MemberName Matches | Format-Table

Which gives:

	Groups        Success Captures                 Index     Length Value
	------        ------- --------                 -----     ------ -----
	{...}         True    {...}                    49        47     ...

or as list with `| Format-List`:

	Groups   : {matched text, captured group}
	Success  : True
	Captures : {matched text}
	Index    : 39
	Length   : 33
	Value    : matched text

Here&#39;s where I stop, I have no idea how to go further and obtain a list of *captured group* elements.

I&#39;ve tried adding another `| ForEach-Object -MemberName Groups`, but it seems to return the same as the above.

The closest I get is with `| Select-Object -Property Groups`, which indeed gives me what I&#39;d expect (a list of sets):

	Groups
	------
	{matched text, captured group}
	{matched text, captured group}
	...

But then I&#39;m unable to extract the *captured group* from each of them, I tried with `| Select-Object -Index 1` I get only one of those sets.

---

Update: a possible solution
---------------------------

It seems that by adding `| ForEach-Object { $_.Groups.Groups[1].Value }` I got what I was looking for, but I don&#39;t understand why - so I can&#39;t be sure I would be able to get the right result when extending this method to whole sets of files.

Why is it working?

As a side note, this `| ForEach-Object { $_.Groups[1].Value }` (i.e. without the second `.Groups`) gives the same result.

I&#39;d like to add that, upon further attempts, it seems the command can be shortened by removing the piped `| Select-Object -Property Groups`.

How to get the captured groups from Select-String?

[PowerShell 5 introduces the `New-TemporaryFile` cmdlet](https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/new-temporaryfile?view=powershell-5.1), which is handy.  How can I do the same thing but instead of a file create a directory?  Is there a `New-TemporaryDirectory` cmdlet?

Create a temporary directory in PowerShell?

I am using react-native to build a cross-platform app, but I do not know how to set the environment variable so that I can have different constants for different environments.

Example:


    development: 
      BASE_URL: &#39;&#39;,
      API_KEY: &#39;&#39;,
    staging: 
      BASE_URL: &#39;&#39;,
      API_KEY: &#39;&#39;,
    production:
      BASE_URL: &#39;&#39;,
      API_KEY: &#39;&#39;,



Setting environment variable in react-native?

**Background:**

Currently we&#39;re using Docker and Docker Compose for our services. We have externalized the configuration for different environments into files that define environment variables read by the application. For example a `prod.env` file:

    ENV_VAR_ONE=Something Prod
    ENV_VAR_TWO=Something else Prod

and a `test.env` file:

    ENV_VAR_ONE=Something Test
    ENV_VAR_TWO=Something else Test

Thus we can simply use the `prod.env` or `test.env` file when starting the container:
   

    docker run --env-file prod.env &lt;image&gt;

Our application then picks up its configuration based on the environment variables defined in `prod.env`. 

**Questions:**

1. Is there a way to provide environment variables from a file in Kubernetes (for example when defining a pod) instead of hardcoding them like this:
&lt;pre&gt;
apiVersion: v1
kind: Pod
metadata: 
  labels: 
    context: docker-k8s-lab
    name: mysql-pod
  name: mysql-pod
spec: 
  containers: 
    - 
      env: 
        - 
          name: MYSQL_USER
          value: mysql
        - 
          name: MYSQL_PASSWORD
          value: mysql
        - 
          name: MYSQL_DATABASE
          value: sample
        - 
          name: MYSQL_ROOT_PASSWORD
          value: supersecret
      image: &quot;mysql:latest&quot;
      name: mysql
      ports: 
        - 
          containerPort: 3306
&lt;/pre&gt;

2. If this is not possible, what is the suggested approach?

Kubernetes equivalent of env-file in Docker

The new ASP.NET Core framework gives us ability to execute different html for different environments:

    &lt;environment names=&quot;Development&quot;&gt;
        &lt;link rel=&quot;stylesheet&quot; href=&quot;~/lib/material-design-lite/material.css&quot; /&gt;
        &lt;link rel=&quot;stylesheet&quot; href=&quot;~/css/site.css&quot; /&gt;
    &lt;/environment&gt;
    &lt;environment names=&quot;Staging,Production&quot;&gt;
        &lt;link rel=&quot;stylesheet&quot; href=&quot;https://ajax.aspnetcdn.com/ajax/bootstrap/3.0.0/css/bootstrap.min.css&quot;
              asp-fallback-href=&quot;~/lib/material-design-lite/material.min.css&quot;
              asp-fallback-test-class=&quot;hidden&quot; asp-fallback-test-property=&quot;visibility&quot; asp-fallback-test-value=&quot;hidden&quot;/&gt;
        &lt;link rel=&quot;stylesheet&quot; href=&quot;~/css/site.css&quot; asp-append-version=&quot;true&quot;/&gt;
    &lt;/environment&gt;

But **how can I determine and visualize the name of the current environment in the `_Layout.cshtml`** of an ASP.NET Core MVC web application?

For example I want to visualize the environment name (Production, Staging, Dev) as a HTML comment for debugging purposes:

    &lt;!-- Environment name: @......... --&gt;

Determine ASP.NET Core environment name in the views

I am trying to run python from the windows command prompt (windows 10). So the result is the typical one when the path environment variable is not configured

     c:\windows\system32&gt;python
    &#39;python&#39; is not recognized as an internal or external command, operable
     program or batch file

however, I am not sure which is the right directory I should set up in the path variable.

I tried a few variations, and none of them work, including:

    c:\users\xxx\anaconda3
    c:\users\xxx\anaconda3\Scripts
    c:\users\xxx\anaconda3\libs\python34

and none of them works.

Does anyone have experience with this particular system constellation (windows, anaconda). Thanks.

anaconda - path environment variable in windows

What&#39;s the simplest way to get an environment variable from a docker container *that has not been declared in the Dockerfile*?

For instance, an environment variable that has been set through some `docker exec container /bin/bash` session?

I can do `docker exec container env | grep ENV_VAR`, but I would prefer something that just returns the value.

I&#39;ve tried using `docker exec container echo &quot;$ENV_VAR&quot;`, but the substitution seems to happen outside of the container, so I don&#39;t get the env var from the container, but rather the env var from my own computer.

Thanks.

Content Type	Original Author	Original Content on Stackoverflow
Question	Tyler S	View Question on Stackoverflow
Solution 1 - Windows	TessellatingHeckler	View Answer on Stackoverflow
Solution 2 - Windows	Gaspare Bonventre	View Answer on Stackoverflow
Solution 3 - Windows	NIK	View Answer on Stackoverflow

Powershell Add System Variable

Windows Problem Overview

Windows Solutions

Solution 1 - Windows

Solution 2 - Windows

Solution 3 - Windows

What is actual difference between GraphicsMagick and ImageMagick?

How can I pass a reference to a stack variable to a thread?

Attributions