Grep Like String search all files and their contents for a path or entire drive.
Warning: With C:* paths you will get a permission error. This tends to be a Windows 10 based security permission for root boot drive accessing. Using a Subfolder or any other partition should mediate.
2019-06-10 update to normalize file path as a variable, as similar to other scripts.
The active operational command is Select-String. https://docs.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/select-string?view=powershell-6
2019-07-15: To be honest, as this script scales up, you might as well fire up a Linux server and actually process your dataset with Grep. This works well processing a file system for configuration scripts but let us say you want to... process a very large spreadsheet for matching values? I suggest switching to running grep, for real.