Скачать или смотреть Using Invoke-Command in a For Loop - A Simple Fix for PowerShell Errors

Learn how to resolve the "One or more computer names are not valid" error in PowerShell by properly utilizing `Invoke-Command` in a for loop.
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This video is based on the question https://stackoverflow.com/q/68880961/ asked by the user 'Seyed Muhammad Alavi' ( https://stackoverflow.com/u/16725785/ ) and on the answer https://stackoverflow.com/a/68881167/ provided by the user 'Theo' ( https://stackoverflow.com/u/9898643/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Using Invoke-Command in a For Loop - A Simple Fix for PowerShell Errors

PowerShell is a powerful tool for system administrators, allowing for remote management of computers and services. However, when using Invoke-Command in a loop to run commands across multiple computers in Active Directory, you may encounter an error that can be frustrating to deal with. Specifically, the message stating:

"Invoke-Command: One or more computer names are not valid."

In this guide, we’ll explore why this error occurs and how you can easily fix it. If you've been working with Active Directory and Invoke-Command, this is a must-read guide for you.

Understanding the Error

When you attempt to run Invoke-Command for each computer in your Active Directory, you may see this error due to passing incorrect object types to the -ComputerName parameter. Let's analyze a piece of code that can trigger this problem:

[[See Video to Reveal this Text or Code Snippet]]

Here, Select-Object returns objects instead of simple string names of the computers. This is the core issue leading to the error you're encountering.

The Solution

To resolve this issue, you can simplify your code. You don’t necessarily need to fetch specific properties like CN since Get-ADComputer returns a set of default properties, including the Name of each computer. Here’s how you can effectively rewrite your code:

Revised Code Example

[[See Video to Reveal this Text or Code Snippet]]

Breaking It Down

Fetching Computer Names:

Instead of selecting the CN property, you're directly accessing the Name property which returns a simple list of computer names.

The command (Get-ADComputer -Filter *).Name does this efficiently and results in a string array, preventing confusion with object types.

Sorting:

The Sort-Object command sorts these computer names in alphabetical order for better organization during execution.

Looping Through the Array:

The foreach loop has been renamed from $i to $computer. This enhances clarity when reading your code.

Additional Noteworthy Points

Variable Naming: Updating variable names can greatly help in understanding your script. Using descriptive names like $computer instead of $i allows others (and yourself) to quickly grasp what your code is doing.

Understanding Active Directory Structure: Each object in AD has a Relative Distinguished Name (RDN). Recognizing what a computer's "Name" property entails can aid your scripting endeavors.

Final Thoughts

By simplifying your command to focus on the necessary properties and utilizing clearer variable names, you can resolve the error related to Invoke-Command. This not only improves the functionality of your script but also makes it more readable and maintainable for future reference.

Feel free to try out the revised code above in your environment and let us know how it worked for you! Remember that PowerShell scripts can be potent tools when wielded with clear and concise logic.