From the documentation :. In lists or, more precisely, System. Note: the same output is returned from. Stack Overflow for Teams — Collaborate and share knowledge with a private group. Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. How do I assign a null value to a variable in PowerShell? Ask Question. Asked 6 years, 10 months ago. If your answer is "no," welcome to our fun little world!
We'd recommend that you first head over to the Script Center, get your feet wet, and then come back to either ask or answer questions. We can't be everywhere at once we know—shocking! The Microsoft Scripting Guys 6 3. Sign in to vote. Thanks -JB. Friday, January 4, AM. Angelopoulos 0. It's an example of a bug I had to chase down before. If there is an error, we log it. Then we check to make sure we got a valid result before processing it.
Update-Something to execute multiple times on the same object in this example. This also helps mitigate scoping issues. But because PowerShell allows variable values from outside the function to bleed into the scope of the current function, initializing them inside your function mitigates bugs that can be introduced that way.
The parent scope could be another function that calls your function and uses the same variable names. If I take that same Do-something example and remove the loop, I would end up with something that looks like this example:.
Initializing the value inside your function mitigates this issue. Naming variables is hard and it's common for an author to use the same variable names in multiple functions.
So it would be very easy for values from different scopes to show up in places where they should not be. There are times when you have commands that output information or objects that you want to suppress.
I don't like the way it looks in my code but it often performs faster than Out-Null. If you're dealing with command-line executables that output on the different streams. I covered a lot of ground on this one and I know this article is more fragmented than most of my deep dives. Skip to main content. This browser is no longer supported. Download Microsoft Edge More info.
Contents Exit focus mode. HR insists that AD accounts use a person's legal name, however many people prefer their nicknames for their email and display names, so a PreferredName field was created in HRIS.
It's got to be my syntax, but I don't see it. This is not technically illegal, but you have strict mode on which will throw an error when you reference a variable that hasn't been initiated. You can avoid this error by skipping the Set-StrictMode cmdlet. It looks like you're trying to check if it's already set and then set some other variable values based on this comparison. Seeing it written out the way you did above made me realize that I was just continuing on another line. Although this doesn't explain why it's worked intermittently.
I just made two minor changes and it seems to be working fine now.
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