Remove duplicate words

Question

I have a string with a few words:

$list1= "apple tree dog cat apple horse tree"

How I can delete duplicate word?

Answer 1

You first have to split the string to receive a list of words. Using Select -Unique will remove all duplicates and finally to transform the list into a single string, you join them using -join:

($list1 -split ' ' | Select -Unique) -join ' '

Output:

apple tree dog cat horse