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I have users in our OU structure that do not get fed an employee ID field in their employeeid attribute. I need to run a script to fill this with a generic value of NPE, but exclude users that have that attribute currently fed through by our HR software. Im new to powershell and we have to have this done today. As much help as i can get would be great. Please assist. 
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I have users in our OU structure that do not get fed an employee ID field in their employeeid attribute. I need to run a script to fill this with a generic value of NPE, but exclude users that have that attribute currently fed through by our HR software. Im new to powershell and we have to have this done today. As much help as i can get would be great. Please assist. 

Powershell script

Windows PowerShell is a task automation and configuration management framework from Microsoft, consisting of a command-line shell and associated scripting language built on the .NET Framework. PowerShell provides full access to the Component Object Model (COM) and Windows Management Instrumentation (WMI), enabling administrators to perform administrative tasks on both local and remote Windows systems as well as WS-Management and Common Information Model (CIM) enabling management of remote Linux systems and network devices.

Powershell

The term 'shell' refers to a general class of text-based command interpreters most often associated with the UNIX and Linux operating systems. Popular shells include Bourne, Debian Almquist (dash), Korn (ksh), Bourne Again (bash) and the C shell family (csh). Some view the DOS 'cmd' prompt as a minimal shell of sorts. It is also possible to install Cygwin on Windows and emulate a full Unix environment with complete shell capabilities. Terminal emulators, such as xterm, GNOME Terminal and OS X Terminal, can be used to access shell.