How can I bulk rename files in PowerShell?

Question

I\'m trying to do the following:

Rename-Item c:\\misc\\*.xml *.tmp

I basically want to change the extension on every files within a directory t

Answer 1

The existing answers suggest the -replace operator, but what if the file is called a.xml.xml? Both .xml substrings will be replaced and the end result would be a.tmp.tmp. Fortunately, there's a .NET method for this:

Dir *.xml | rename-item -newname { [io.path]::ChangeExtension($_.name, ".tmp") } 

(Manish Kumar was close with GetFileNameWithoutExtension but this is more elegant and probably a bit more efficient, not that it overly matters in this case)