Use the `Out-File` cmdlet

     Compare-Object ... | Out-File C:\filename.txt

Optionally, add `-Encoding utf8` to `Out-File` as the default encoding is not really ideal for many uses.

The simplest way is to just redirect the output, like so:

    Compare-Object $(Get-Content c:\user\documents\List1.txt) $(Get-Content c:\user\documents\List2.txt) &gt; c:\user\documents\diff_output.txt

`&gt;` will cause the output file to be overwritten if it already exists.  
`&gt;&gt;` will append new text to the end of the output file if it already exists.

Another way this could be accomplished is by using the `Start-Transcript` and `Stop-Transcript` commands, respectively before and after command execution. This would capture the entire session including commands. 

[Start-Transcript][1]

[Stop-Transcript][2]

For this particular case `Out-File` is probably your best bet though.


  [1]: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.host/start-transcript?view=powershell-6
  [2]: https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.host/stop-transcript?view=powershell-6

I want to ask what the `with_metaclass()` call means in the definition of a class.

E.g.:

    class Foo(with_metaclass(Cls1, Cls2)):

 - Is it a special case where a class inherits from a metaclass? 
 - Is the new class a metaclass, too?

Python Metaclass : Understanding the &#39;with_metaclass()&#39;

What&#39;s the difference between the `Window.Loaded` and `Window.ContentRendered` events in WPF?  Is the `ContentRendered` event called first? 

The description of the `Window.ContentRendered` event [here][1] just says

&gt; Occurs after a window&#39;s content has been rendered.

The description of the `Window.Loaded` event [here][2] says

&gt; Occurs when the element is laid out, rendered, and ready for interaction. 

I have a case where I want to set the window&#39;s `MaxHeight` to the height of the working area of the screen that is displaying my window.  Which event should I do it in?

Edit:

I think I found what I was looking for, but I&#39;m even more confused now.  The `Loaded` event happens first and then the `ContentRendered` event happens.  In the book Programming WPF by Chris Sells &amp; Ian Griffiths, it says that the `Loaded` event is 

&gt; Raised just before the window is shown

While the &#39;ContentRendered` event is 

&gt; Raised when the window&#39;s content is visually rendered.

This contradicts what the MSDN documentation says about the `Loaded` event:

&gt; Occurs when the element is laid out, rendered, and ready for interaction. 

This is even more confusing now.


  [1]: http://msdn.microsoft.com/en-us/library/system.windows.window.contentrendered.aspx
  [2]: http://msdn.microsoft.com/en-us/library/system.windows.frameworkelement.loaded.aspx

What&#39;s the difference between the Window.Loaded and Window.ContentRendered events

I&#39;ve compared two files using the following code:

    Compare-Object $(Get-Content c:\user\documents\List1.txt) $(Get-Content c:\user\documents\List2.txt) 

How can I write the output of this to a new text file? I&#39;ve tried using an echo command, but I don&#39;t really understand the syntax.



Write output to a text file in PowerShell

I've compared two files using the following code:
<pre><code class="hljs language-sql">Compare-Object $(Get-Content c:\user\documents\List1.txt) $(Get-Content c:\user\documents\List2.txt) 
</code></pre>
How can I write the output of this to a new text file? I've tried using an echo command, but I don't really understand the syntax.

I&#39;m having an issue with powershell when invoking an exe at a path containing spaces.

`PS C:\Windows Services&gt; invoke-expression &quot;C:\Windows Services\MyService.exe&quot;`

&gt; The term &#39;C:\Windows&#39; is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.

It seems to be splitting on the space between &#39;Windows&#39; and &#39;Services&#39;. Any idea how to get around this problem?



Spaces cause split in path with PowerShell

I am using the PowerShell script from [this answer][1] to do a file copy. The problem arises when I want to include multiple file types using the filter. 

    Get-ChildItem $originalPath -filter &quot;*.htm&quot;  | `
       foreach{ $targetFile = $htmPath + $_.FullName.SubString($originalPath.Length); ` 
     New-Item -ItemType File -Path $targetFile -Force;  `
     Copy-Item $_.FullName -destination $targetFile }

works like a dream. However, The problem arises when I want to include multiple file types using the filter. 

    Get-ChildItem $originalPath ` 
      -filter &quot;*.gif&quot;,&quot;*.jpg&quot;,&quot;*.xls*&quot;,&quot;*.doc*&quot;,&quot;*.pdf*&quot;,&quot;*.wav*&quot;,&quot;.ppt*&quot;)  | `
       foreach{ $targetFile = $htmPath + $_.FullName.SubString($originalPath.Length); ` 
     New-Item -ItemType File -Path $targetFile -Force;  `
     Copy-Item $_.FullName -destination $targetFile }

Gives me the following error:

    Get-ChildItem : Cannot convert &#39;System.Object[]&#39; to the type &#39;System.String&#39; required by parameter &#39;Filter&#39;. Specified method is not supported.
    At F:\data\foo\CGM.ps1:121 char:36
    + Get-ChildItem $originalPath -filter &lt;&lt;&lt;&lt;  &quot;*.gif&quot;,&quot;*.jpg&quot;,&quot;*.xls*&quot;,&quot;*.doc*&quot;,&quot;*.pdf*&quot;,&quot;*.wav*&quot;,&quot;.ppt*&quot; | `
        + CategoryInfo          : InvalidArgument: (:) [Get-ChildItem], ParameterBindingException
        + FullyQualifiedErrorId : CannotConvertArgument,Microsoft.PowerShell.Commands.GetChildItemCommand

I have various iterations of parentheses, no parentheses, `-filter`, `-include`, defining the inclusions as variable (e.g., `$fileFilter`) and each time get the above error, and always pointing to whatever follows `-filter`.

The interesting exception to that is when I code `-filter &quot;*.gif,*.jpg,*.xls*,*.doc*,*.pdf*,*.wav*,*.ppt*&quot;`. There are no errors, but I and get no results and nothing back to the console. I suspect I&#39;ve inadvertently coded an impicit `and` with that statement?

So what am I doing wrong, and how can I correct it?


  [1]: https://stackoverflow.com/questions/5432290/how-to-use-powershell-copy-item-and-keep-structure

How to properly -filter multiple strings in a PowerShell copy script

I&#39;m trying to create a JSON-serialized array. When that array contains only one item I get a string, not an array of strings (in JSON).

Multiple Items (works as expected):

    PS C:\&gt; @(&quot;one&quot;, &quot;two&quot;) | ConvertTo-JSON
    [
        &quot;one&quot;,
        &quot;two&quot;
    ]

Single Item Array (not as expected):

    PS C:\&gt; @(&quot;one&quot;) | ConvertTo-JSON
    &quot;one&quot;

Am I missing something?

ConvertTo-JSON an array with a single item

I&#39;ve got some additional functions that I&#39;ve defined in an additional PowerShell script file, that I&#39;m trying to load in a main .ps1 file. However, when I call the .ps1 file from the PowerShell prompt it doesn&#39;t seem to run through those commands.

In the following code example, build_functions.ps1 has code that defines various custom functions. If I run the file separately (for example, running it by itself and then running through the primary script) it works fine. Build_builddefs.ps1 contains a number of variables that also need to be populated prior to running the primary script.

At the beginning of my primary script I have this:

    .\build_functions.ps1
    .\build_builddefs.ps1

However, these don&#39;t seem to be run, because the primary script fails when it tries to execute the first custom function. What am I doing wrong?


Loading custom functions in PowerShell

How can I hide the progress display of `Invoke-WebRequest`? I do a lot of successive requests and have my own `Write-Progress` display that I use, so I don&#39;t need the built-in one popping up underneath it every time.

I use the mshtml results (the IE COM object) that are created from the result of `Invoke-WebRequest` automatically, so I can&#39;t switch to a `WebClient` or something like that, unless someone provides instructions on how to get an mshtml object from a WebClient request.

Hide progress of Invoke-WebRequest

This function doesn&#39;t work and raises an error. Do I need to change any arguments or parameters?  


    import sys
    
    def write():
    	print(&#39;Creating new text file&#39;) 
    	
    	name = input(&#39;Enter name of text file: &#39;)+&#39;.txt&#39;  # Name of text file coerced with +.txt
    	
    	try:
    		file = open(name,&#39;r+&#39;)   # Trying to create a new file or open one
    		file.close()
    		
    	except:
    		print(&#39;Something went wrong! Can\&#39;t tell what?&#39;)
    		sys.exit(0) # quit Python
    		
    write()

Error when creating a new text file with python?

I have a need to watch a log file for changes.  After looking through stackoverflow questions, I see people recommending `watchdog`.  So I&#39;m trying to test, and am not sure where to add the code for when files change:
```python
import time
from watchdog.observers import Observer
from watchdog.events import LoggingEventHandler

if __name__ == &quot;__main__&quot;:
    event_handler = LoggingEventHandler()
    observer = Observer()
    observer.schedule(event_handler, path=&#39;.&#39;, recursive=False)
    observer.start()
    try:
        while True:
            time.sleep(1)
        else:
            print &quot;got it&quot;
    except KeyboardInterrupt:
        observer.stop()
    observer.join()
```

Where do I add the &quot;got it&quot; — in the `while` loop if the files have been added/changed?


watchdog monitoring file for changes

I was trying to read a file into an array by using FileInputStream, and an ~800KB file took about 3 seconds to read into memory. I then tried the same code except with the FileInputStream wrapped into a BufferedInputStream and it took about 76 milliseconds. Why is reading a file byte by byte done so much faster with a BufferedInputStream even though I&#39;m still reading it byte by byte? Here&#39;s the code (the rest of the code is entirely irrelevant). Note that this is the &quot;fast&quot; code. You can just remove the BufferedInputStream if you want the &quot;slow&quot; code: 
        
    InputStream is = null;

        try {
            is = new BufferedInputStream(new FileInputStream(file));

            int[] fileArr = new int[(int) file.length()];

            for (int i = 0, temp = 0; (temp = is.read()) != -1; i++) {
                fileArr[i] = temp;
            }
BufferedInputStream is over 30 times faster. Far more than that. So, why is this, and is it possible to make this code more efficient (without using any external libraries)?

Why is using BufferedInputStream to read a file byte by byte faster than using FileInputStream?

    import csv    
    
    with open(&#39;v.csv&#39;, &#39;w&#39;) as csvfile:
        cwriter = csv.writer(csvfile, delimiter=&#39; &#39;, quotechar=&#39;|&#39;, quoting=csv.QUOTE_MINIMAL)

    for w, c in p.items():
        cwriter.writerow(w + c)

Here, `p` is a dictionary, `w` and `c` both are strings.

When I try to write to the file it reports the error:

&lt;!-- language: lang-none --&gt;

    ValueError: I/O operation on closed file.

ValueError : I/O operation on closed file

I am using an HTML file input like this: 

    &lt;input type=&quot;file&quot; accept=&quot;video/*&quot;&gt; 

to allow my users to upload videos to my site. This works as expected in all modern browsers (only permitting the user to select video files) except Safari.


From what I can tell Safari seems to interpret the `accept=&quot;video/*&quot;` attribute as `accept=&quot;*.mov&quot;` ignoring most, if not all, other video formats / extensions (webm, m4v, etc).

Any suggestions on how to get the select dialog to allow only common video filetypes (not just .mov&#39;s) in Safari?

Content Type	Original Author	Original Content on Stackoverflow
Question	bookthief	View Question on Stackoverflow
Solution 1 - Powershell	manojlds	View Answer on Stackoverflow
Solution 2 - Powershell	Matt	View Answer on Stackoverflow
Solution 3 - Powershell	Aaron Krone	View Answer on Stackoverflow

Write output to a text file in PowerShell

Powershell Problem Overview

Powershell Solutions

Solution 1 - Powershell

Solution 2 - Powershell

Solution 3 - Powershell

What's the difference between the Window.Loaded and Window.ContentRendered events

Python Metaclass : Understanding the 'with_metaclass()'

Attributions