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Jeffrey Hicks builds a useful function:

If there’s one task I’ve never stopped doing, it is finding files. I am constantly creating new ways to organize files and display them in a meaningful format. Naturally, PowerShell is a great tool for this task. Get-ChildItem is obviously the proper starting point. The cmdlet works fine in getting only files from a folder and I can do basic early filtering by name and extension with wildcards. But my latest task was organizing files by date, and because of the way Get-ChildItem works under-the-hood, I’m going to need to resort to late filtering with Where-Object. There’s nothing wrong with that. But if this is a task I’m likely to repeat, then a PowerShell function is on the drawing board. My goal is to create a function that will display files grouped into aging buckets such as 1-week or 6-months. Even though I’m primarily concerned with age based on the last write time, I (or you) might have a need to base aging on the creation time. Let’s code.

Click through for a great walkthrough and code.