是否有一行代码可以使用Powershell更改所有文件夹和子文件夹的文件扩展名？

Question

I used the following code to batch change one extension in one folder at a time.

Dir *.mkv | rename-item -newname { $_.name -replace ".mkv",".vlc" }

What I want is to be able to have one line of code that will

• change all file extension types to one file extension

• include files inside sub folders

Any help on this would be greatly appreciated, THANKS

Answer 1

Use -Recurse to include subfolders. Use BaseName which is the filename without extension.
Read the documentation for more info on either

Get-ChildItem *.mkv -Recurse | Rename-Item -NewName {"$($_.BaseName).vlc"}

Edit

Apologies, I missed this part:

change all file extension types to one file extension

To change all file extensions you just need to exclude the *mkv but as covered by LotPings's answer this isn't recommended; it's very easy to change the extension of files you didn't mean to. He covers using the -Include parameter, which is the recommended way as it filters early on.

In the interest of showing another way, you could use the Extension property. This allows you to leverage all of the PowerShell comparison operators - examples below.

Get-ChildItem -Recurse | Where-Object {$_.Extension -eq ".mkv"}
Get-ChildItem -Recurse | Where-Object {$_.Extension -in @(".mkv",".avi")}
Get-ChildItem -Recurse | Where-Object {$_.Extension -ne ".vlc"}

Answer 2

as you also tagged it batch-file :

for /r %%a in (*.mkv) do @ECHO ren "%%a" "%%~na.vlc"

(this is batch-file syntax. If you want to use it directly on command line)

for /r %a in (*.mkv) do @ECHO ren "%a" "%~na.vlc"

Remove @ECHO , if the output fits your needs.

Answer 3

I wouldn't change ALL extensions, just use -Include and present a list

Get-ChildItem -Path X:\start\here -Recurse -Include ('*.mkv','*.xyz')| Rename-Item -NewName {$_.BaseName+'.vlc'} -WhatIf

If the output looks OK, remove the trailing -WhatIf