Category Archives: microsoft

getting a web page with basic authentication using powershell

pont d'amour Getting a web page using PowerShell is pretty easy using Invoke-WebRequest. Getting a web page which is protected using basic authentication isn’t that much harder, but it took me a while to find out how to do that exactly as my initial searches didn’t turn up the right answers.

The trick is that you have to pass in a credential object when you make the call:

$result = Invoke-WebRequest http://foo.com -Credential $credential

That $credential object is something you have to create. If you don’t pass in an object, you’ll get a prompt btw, which might also be handy.
Creating the object is done like this:

$user = "john.doe"
$password = ConvertTo-SecureString "a_password" -AsPlaintext -Force
$credential = New-Object PSCredential($user, $password)

The PSCredential object is created and the username and a secure password string is passed into the constructor.

Putting the username and password in your script like this is a bad idea in a lot of cases, so you should really consider if this what you want to do. You can also use the Get-Credential cmdlet to ask the user for the username and password instead.
That way you keep this sensitive data out of your script and make it more resilient to change as well.
This is all it takes to ask for the credentials and set them into a variable you use later on:

$credential = Get-Credential

erase free space on an SSD drive

DeleteAs you probably know (because you’re reading this post) Windows doesn’t really destroy a file when it is deleted. It merely removes the references in the file table so you don’t see it in on the file system anymore. But the file is still intact sitting there on your hard drive until some other file is written over it.
If you want to truly erase those files on a HDD drive you can use a number of tools to erase the free space on the drive. What these tools do is simply overwrite all free space with random data and thus effectively overwriting and destroying those deleted files still sitting intact in your free disk space.
Free tools that can do this are the command line Secure Delete tool from System Internals and the handy CCleaner (see the tools menu).

For an SSD drive however overwriting the free space with random data is bad for your drive. SSD’s have a limited number of times you can write data to their blocks. Using a random data overwrite tool, which can even end up do this multiple times, is just a bad idea.

Luckily everything is built into your SSD drive to do this automatically. It’s called the TRIM function and from Windows 7 on this is activated by default so normally you don’t have to do a thing to take advantage of this secure-delete feature.

However if you are like me then you want to be sure if this feature is activated.
On Windows, you can do this by opening a command prompt and entering the following command:

fsutil behavior query disabledeletenotify

If you get the following, your TRIM command is already active on Windows:

NTFS DisableDeleteNotify = 0

If this would return a value of 1, you can activate the TRIM function with this command:

fsutil behavior set DisableDeleteNotify 0

You can find more detailed instructions and information about activating the TRIM function here:
How to check if TRIM is enabled on your SSD and how to enable it
Why SSD TRIM support is so important and how to enable it

And then there’s always Google of course.

Photo by Delete, cc-licensed.

how to move an unreachable window on windows 7, 8 or 10

arrowsOn the “good” old XP this required some trickery and knowledge of window specific shortcuts, but on more recent version of Windows this has become really easy to do.

So if you run into a situation where an application’s window is outside your visible area, because you disconnected a second screen for example and the app doesn’t automatically snap to the only screen left, simply do this:

  • Keep the Windows key pressed and hit the cursor key left or right.

Your window will simply snap back to your current screen and all is well.
Using it with the up & down arrow will maximize or minimize the active window. Always handy to know those shortcuts if you have both hands on the keyboard anyway.

Photo by Dean Hochman, cc-licensed.