Скачать или смотреть How to Get the Output Without the Variable Value Using WMIC in PowerShell

Discover how to retrieve specific output from `WMIC` commands in PowerShell without the variable value. This guide provides actionable steps and alternative methods for obtaining concise results.
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This video is based on the question https://stackoverflow.com/q/74100329/ asked by the user 'PS-Junior' ( https://stackoverflow.com/u/20265159/ ) and on the answer https://stackoverflow.com/a/74101325/ provided by the user 'Toni' ( https://stackoverflow.com/u/19895159/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Troubleshooting WMIC Output in PowerShell

PowerShell is a powerful scripting language that is frequently used for task automation and configuration management. However, users sometimes encounter challenges when executing commands, particularly when working with legacy commands like WMIC (Windows Management Instrumentation Command-line).

One common issue arises when trying to obtain results without additional text clutter. For example, when executing the command wmic OS Get DataExecutionPrevention_SupportPolicy, users find that they get more output than anticipated, including headers and formatting artifacts.

In this blog, we'll explore how to effectively retrieve specific outputs using WMIC, and provide you with a cleaner, more organized approach to manage your data.

Understanding the Output of WMIC

When you run a WMIC command, it returns an array of strings. For example, executing:

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Results in:

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Notice that the result includes both a header and the desired output (in this case, the numeric value 2). To extract just the value without the header, you will need to specify how you parse the command's output.

Steps to Extract the Desired Output Using WMIC

Step 1: Accessing the Specific Data Value

You can directly extract the numeric value you are interested in by referencing its index from the array returned by WMIC. Here’s how to do that:

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This command accesses the third element in the returned array (arrays in PowerShell are zero-indexed), which contains the numeric value we're after.

Step 2: Using Get-CimInstance

While WMIC is functional, PowerShell has cleaner alternatives that return objects rather than simple strings. One of these is Get-CimInstance, which is generally preferred for its object-oriented response.

To retrieve the DataExecutionPrevention_SupportPolicy value using Get-CimInstance, follow these steps:

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Step 3: Simplifying Output to True/False

If your goal is to determine whether the current DataExecutionPrevention_SupportPolicy value equals a desired number (for example, 2), you don’t need to store that value beforehand. You can query it as follows:

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The command checks if the queried value meets your criteria and returns true or false accordingly.

Step 4: Exporting Results to CSV

If you also want to know which value is set and produce a more structured output, you can create a custom object and export it as a CSV file:

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This script captures the current value, checks if it meets your expectation, and saves the results in a CSV file for further analysis.

Conclusion

Using PowerShell effectively involves understanding how to parse and manipulate command output. By utilizing commands like Get-CimInstance, you can streamline how you obtain necessary data points and reduce clutter in your outputs.

Whether you need simple boolean indicators or detailed reports, PowerShell offers powerful tools to help you accomplish your tasks efficiently.

Remember, the next time you face an issue with WMIC, consider using these methods to get cleaner and more manageable output!