Rename all files in a directory using Powershell

	#All the files in the directory are uppercase i.e "TEST.TXT"
	#We set the first letter to lowercase for this example
	gci -Path D:\temp\ -File -Filter "*.txt" | foreach{$_| `
	Rename-Item -NewName $($_.Name.substring(0,1).Tolower() + $_.Name.Substring(1))} -ErrorAction SilentlyContinue

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