<div>
Hi Ward, 
could you provide the machine list? How did you create this list of strings? 
 
As far as I can remember, the unique command needs to have the list sorted. 
What does this return: 

<pre><code id="code-20-39718737-1">$a = $machine_list | Sort-Object | Select-Object -Unique</code></pre>
 
HTH 
Rainer
</div>

Hi Ward,
could you provide the machine list? How did you create this list of strings?

As far as I can remember, the unique command needs to have the list sorted.
What does this return:


$a = $machine_list | Sort-Object | Select-Object -Unique


HTH
Rainer

<div>
<div class="content wysiwyg-content">
Hi, 
 
I have the following problem with powershell. 
 
I have a list of strings call it $machine_list which 
I know there are duplicates. 
 
The following &nbsp;code produces the following output: 
 

<pre><code id="code-10-28318256-1">$machine_list.count -- 15375

$a = $machine_list | Select-Object -Unique
$a.Count -- 12134

$b = $machine_list | Group-Object -NoElement
$b.Count -- 12082</code></pre>
 
I am trying to get a unique list and looking at different 
ways of doing it. 
 
So in my example above why are the counts different? 
Should they not be the same - $a.Count -eq $b.Count? 
 
I am hoping somebody can explain this in more detail to me. 
 
Also is there a way I can compare the results to see how they 
differ? (Comparing $a with the Name Values of $b). 
 
Thanks, 
 
Ward.
</div>
</div>

Hi,

I have the following problem with powershell.

I have a list of strings call it $machine_list which
I know there are duplicates.

The following  code produces the following output:

(CODE)

I am trying to get a unique list and looking at different
ways of doing it.

So in my example above why are the counts different?
Should they not be the same - $a.Count -eq $b.Count?

I am hoping somebody can explain this in more detail to me.

Also is there a way I can compare the results to see how they
differ? (Comparing $a with the Name Values of $b).

Thanks,

Ward.

Powershell - Select-Object -Unique vs Group-Object

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.