Output Group-Object Column to File - powershell

Question

Using Powershell I created a data set like this.
Count Name Group
----- ---- -----
2 108005 {108005, 108005}
2 114763 {114763, 114763}
2 115826 {115826, 115826}
2 115925 {115925, 115925}
2 117435 {117435, 117435}
2 114152 {114152, 114152}
2 117093 {117093, 117093}
Using this code.
$check = Get-Content $file | Group | Where {$_.count -gt 1}
I used the code to check for duplicates and cannot figure out how to output the Name column to a list in a plain txt file with only the names. There doesn't seem to be much documentation on how to do this. Is this even possible?

Answer 1

Use either ForEach-Object or Select-Object -ExpandProperty:
$duplicates = Get-Content $file | Group | Where {$_.count -gt 1} |Select-Object -ExpandProperty Name
Since you don't need anything other than the name, you can avoid generating the individual sets during grouping, with the -NoElement switch parameter:
$duplicates = Get-Content $file | Group -NoElement | Where {$_.count -gt 1} |Select-Object -ExpandProperty Name