I need to create an array of templates that refer to a particular rendering. In some templates, renderings are placed twice. So, array contains 2 copies of same templates. What is the sitecore powershell command to remove duplicate items from an array of sitecore items?

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You can simply remove the duplicate items from the array by using Sort-Object with the -Unique switch, It will combine sorting with the removal of duplicates. Alias of Sort-Object is sort -

$YourItemArrayList | sort -unique

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