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Powershell: Issues with Get-unique

Posted on 2010-11-15
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Last Modified: 2012-05-10
I have two questions regarding the get-unique cmdlet.

One:
If I have a txt file with 100 computer names with duplicates I want the duplicates to be removed.
I have the following lines but they do not remove duplicates properly.

[array]$colComputers = get-content "c:\temp\ISP\listAllComputers.txt" | Sort-Object | Get-Unique

no duplicates are removed. Am I using this right?

Question two:
Is there a way to invoke the get-unique where it does not care or check for uppercase or lowercase?
For example with the following txt file entries:
apple
pear
APPLE
ApPle

there will be only two ouputs
apple
pear

thanks in advance,
K
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Question by:kabaam
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Accepted Solution

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daveTechSearch earned 250 total points
ID: 34138657
try this instead:
[array]$colComputers = get-content "c:\temp\ISP\listAllComputers.txt" | Sort-Object -unique
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Expert Comment

by:KenMcF
ID: 34138691
I do not think you can account for different case. You could create an array and change all computer account to upper or lower case so they all match then select the unique ones.


$cmps = @()
gc "c:\temp\ISP\listAllComputers.txt" | %{$cmps += $_.toupper()}
$cmps | sort | get-unique
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LVL 27

Expert Comment

by:KenMcF
ID: 34138711
The way daveTechSearch mentioned, is much easier. I forgot that the switch in select was not case sensitive.
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Author Comment

by:kabaam
ID: 34139308
Thanks Dave,

Using that technique did solve both concerns.
I had a feeling I may end up having to go the route you KenMcF mentioned.

Thank you both,
K

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