Rename-Item cmdlet is used to rename a File by passing the path of the file to be renamed and target name.
In this example, we'll rename a folder D:\Temp\Test\test.txt to test1.txt
Type the following command in PowerShell ISE Console
Rename-Item D:\temp\Test\test.txt test1.txt
You can see the test.txt renamed to test1.txt in Windows explorer.