Get-Unique

Get-Unique oddities

Firstly, unlike almost all tools in PowerShell, Get-Unique is case sensitive. Not by default, it is just case sensitive, there is not an option to change this.

Secondly, Get-Unique requires its input to be pre-sorted. If this is not the case then one has to use Sort-Object. But Sort-Object has the option Unique itself, so that use of Get-Unique becomes redundant. Besides, Sort-Object provides the options Property, CaseSensitive, Culture.

Yet another alternative is Select-Object -Unique.

Get-Unique can be useful though. If only adjacent case sensitive duplicates should be removed then the cmdlet does this exactly. But the name is confusing.

Scripts

• case.sensitive.ps1 shows that Get-Unique is case sensitive.
• requires.sorted.input.ps1 shows that Get-Unique does not work for not sorted list.

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• Microsoft Connect 77601
• Microsoft Connect 872943