Dont use spaces:

    SET @var=&quot;GREG&quot;
    ::instead of SET @var = &quot;GREG&quot;
    ECHO %@var%
    PAUSE

Try the following (note that there should not be a space between the `VAR`, `=`, and `GREG`).

    SET VAR=GREG
    ECHO %VAR%
    PAUSE

I have been using `Math.Round(myNumber, MidpointRounding.ToEven)` in C# to do my server-side rounding, however, the user needs to know &#39;live&#39; what the result of the server-side operation will be which means (avoiding an [Ajax][1] request) creating a JavaScript method to replicate the `MidpointRounding.ToEven` method used by C#.

MidpointRounding.ToEven is Gaussian/[banker&#39;s rounding][2], a very common rounding method for accounting systems described [here][3].

Does anyone have any experience with this? I have found examples online, but they do not round to a **given** number of decimal places...

  [1]: http://en.wikipedia.org/wiki/Ajax_%28programming%29
  [2]: https://en.wikipedia.org/wiki/Rounding#Round_half_to_even
  [3]: http://en.wikipedia.org/wiki/Rounding#Round_half_to_even


Gaussian/banker&#39;s rounding in JavaScript

I have a model that has an attribute that is an Array. What&#39;s the proper way for me to populate that attribute from a form submission?

I know having a form input with a field whose name includes brackets creates a hash from the input. Should I just be taking that and stepping through it in the controller to massage it into an array?

Example to make it less abstract:

    class Article
      serialize :links, Array
    end

The links variable takes the form of a an array of URLs, i.e. `[[&quot;http://www.google.com&quot;], [&quot;http://stackoverflow.com&quot;]]`

When I use something like the following in my form, it creates a hash:
    
    &lt;%= hidden_field_tag &quot;article[links][#{url}]&quot;, :track, :value =&gt; nil %&gt;

The resultant hash looks like this: 

    &quot;links&quot; =&gt; {&quot;http://www.google.com&quot; =&gt; &quot;&quot;, &quot;http://stackoverflow.com&quot; =&gt; &quot;&quot;}

If I don&#39;t include the url in the name of the link, additional values clobber each other:
    
    &lt;%= hidden_field_tag &quot;article[links]&quot;, :track, :value =&gt; url %&gt;

The result looks like this: `&quot;links&quot; =&gt; &quot;http://stackoverflow.com&quot;`

Ruby on Rails: Submitting an array in a form

I have this little batch script:

    SET @var = &quot;GREG&quot;
    ECHO %@var%
    PAUSE

When I run it, it prints:

    H:\Dynamics&gt;SET @var = &quot;GREG&quot;
    
    H:\Dynamics&gt;ECHO
    ECHO is on.
    
    H:\Dynamics&gt;PAUSE
    Press any key to continue . . .

Why won&#39;t it print the contents of @var?  How do I know if @var is even being set?

Batch - Echo or Variable Not Working

I have this little batch script:
<pre><code class="hljs language-sql">SET @var = "GREG"
ECHO %@var%
PAUSE
</code></pre>
When I run it, it prints:
<pre><code class="hljs language-vbnet">H:\Dynamics>SET @var = "GREG"

H:\Dynamics>ECHO
ECHO is on.

H:\Dynamics>PAUSE
Press any key to continue . . .
</code></pre>
Why won't it print the contents of @var? How do I know if @var is even being set?

After installation of Android SDK, there was created `.android` folder on the `E:\` drive. As far as I know this is the default folder of Android Virtual Devices for configuration files.

How can I move `.android` folder to a different location?

(eg. from `E:\.android` to `E:\Android\.android`)



Moving default AVD configuration folder (.android)

I am trying to determine whether a string input by a user is valid for representing a path to a folder. By valid, I mean formatted properly.

In my application, the folder represents an installation destination. Provided that the folder path *is* valid, I want to determine if the folder exists, and create it if it does not.

I am currently using `IO.Directory.Exists( String path )`. I find that this works fine except when the user does not format the string properly. When that happens, this method will return false which indicates that the folder does not exist. But this is a problem because I won&#39;t be able to create the folder afterwards.

From my googling I found a suggestion to use a regular expression to check if the format is proper. I have no experience with regular expressions, and am wondering if that is a viable approach. Here&#39;s what I found:

    Regex r = new Regex( @&quot;^(([a-zA-Z]\:)|(\\))(\\{1}|((\\{1})[^\\]([^/:*?&lt;&gt;&quot;&quot;|]*))+)$&quot; );
    return r.IsMatch( path );

Would a regular expression test in combination with `Directory.Exists()`, give me a *good enough* method to check if the path is valid and whether it exists? I know this will vary with the OS and other factors, but the program is targeted for **Windows** users only.

Check if a string is a valid Windows directory (folder) path

I was wondering what the difference between the WM_QUIT, WM_CLOSE, and WM_DESTROY messages in a windows program, essentially: when are they sent, and do they have any automatic effects besides what&#39;s defined by the program?

What is the difference between WM_QUIT, WM_CLOSE, and WM_DESTROY in a windows program?

How can I try CoffeeScript on Windows?

The installation instructions are only for *nix: http://jashkenas.github.com/coffee-script/#installation

EDIT:

Since I asked this a while ago, many new answers have appeared.  The number ( and quality ) of options for Windows users has been increased a lot.  I &quot;accepted&quot; an answer a long time ago, then changed to other ( better ) answers as they came up, but I have now decided to not accept any answer, and let the community ( votes ) show which answers are best.  Thanks to everyone for the input.


CoffeeScript on Windows?

```python
import csv

with open(&#39;test.csv&#39;, &#39;w&#39;) as outfile:
    writer = csv.writer(outfile, delimiter=&#39;,&#39;, quoting=csv.QUOTE_MINIMAL)
    writer.writerow([&#39;hi&#39;, &#39;dude&#39;])
    writer.writerow([&#39;hi2&#39;, &#39;dude2&#39;])
```

The above code generates a file, `test.csv`, with an extra `\r` at each row, like so:

    hi,dude\r\r\nhi2,dude2\r\r\n

instead of the expected

    hi,dude\r\nhi2,dude2\r\n

Why is this happening, or is this actually the desired behavior?

CSV in Python adding an extra carriage return, on Windows

I&#39;m searching (without success) for a script, which would work as a batch file and allow me to prepend a UTF-8 text file with a BOM if it doesn&#39;t have one.

Neither the language it is written in (perl, python, c, bash) nor the OS it works on, matters to me. I have access to a wide range of computers.

I&#39;ve found a lot of scripts to do the reverse (strip the BOM), which sounds to me as kind of silly, as many Windows program will have trouble reading UTF-8 text files if they don&#39;t have a BOM.

Did I miss the obvious?

Thanks!

Adding BOM to UTF-8 files

I have the following batch script from Wikipedia:

    @echo off
        for /R &quot;C:\Users\Admin\Ordner&quot; %%f in (*.flv) do (
        echo %%f
    )
    pause



In the for-loop all files with the extension flv get echoed,
but I want the make some actions with the file(s)
where I need one time the file without the extension and one time with the extension.
How could I get these two?

I searched for solutions but I don&#39;t find one.
I&#39;m a real newbie in batch...

Batch: Remove file extension

When I have `setlocal ENABLEDELAYEDEXPANSION` set in a cmd script is there any way I can escape a ! that I want to use as a parameter to a command? 

    @echo off
    setlocal ENABLEDELAYEDEXPANSION
    echo I want to go out with a bang!
    echo I still want to go out with a bang^!


How can I escape an exclamation mark ! in cmd scripts?

I want to write a batch file that performs the following operations: 
 
 * Check if a service is running  
  * If is it running, quit the batch  
  * If it is not running, start the service  

The code samples I googled so far turned out not to be working, so I decided not to post them. 

Starting a service is done by:

    net start &quot;SERVICENAME&quot;

1. How can I check if a service is running, and how to make an if statement in a batchfile?  
2. I&#39;m a bit confused. What is the argument I have to pass onto the net start? The service name or its display name?

How to check if a service is running via batch file and start it, if it is not running?

In windows batch file, if myScript.bat runs otherScript.bat, and in otherScript.bat, there&#39;s a pause in first line. How can I send a keystroke to skip that pause in myScript.bat? So my script won&#39;t need to take any extract keystroke and won&#39;t be blocked by the pause. Thanks.

Content Type	Original Author	Original Content on Stackoverflow
Question	Greg	View Question on Stackoverflow
Solution 1 - Windows	tcooc	View Answer on Stackoverflow
Solution 2 - Windows	Jonathan Stanton	View Answer on Stackoverflow

Batch - Echo or Variable Not Working

Windows Problem Overview

Windows Solutions

Solution 1 - Windows

Solution 2 - Windows

Ruby on Rails: Submitting an array in a form

Gaussian/banker's rounding in JavaScript

Attributions