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Adam BrownFlag for United States of America

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Determining if something exists in Powershell

This is going to be kind of a weird one to explain.
I'm trying to write a code that will go through an AD Domain and build Security Groups for each OU, placing them in a specific, separate OU. I have the code for this already, it works great, but I want to add a little more functionality.

What I'm wondering is, what would I do in an if statement to determine if a security group exists or if a user is already a member of a group, etc. etc. etc.

Basically, if I wanted to write a script that looked through an OU for users, and checked to see if they were already a member of a specific security group, what would that look like?
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Chris Dent
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That helps a lot with one part of the problem I'm working on. Right now I am working mostly with the native commands, since I need to build scripts that basically run right out of the box without additional downloads. Basically, I've been tasked with developing the scripts necessary to build an AD environment up from CSVs and additional scripts to keep them maintained. And I just started working with powershell like a month ago :S