Rename files having no extension

Question

How can we rename all files in a folder having no extension at all to ".something". I have tried ren *.* *.jpeg and few more but nothing working

Possible duplicate of [Find and rename files with no extension?](https://stackoverflow.com/questions/1025410/find-and-rename-files-with-no-extension) — Rishav, Feb 26 '18 at 18:56

Jeroen Mostert · Answer 1 · 2018-02-26T14:48:31.307

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* matches any extension. You want to match no extension, so don't supply one: ren *. *.jpeg.

The above only works in cmd -- PowerShell's wildcards work differently, and mostly don't do anything special with extensions. What's more, batch renaming in PowerShell works differently. So:

dir -Filter "*." -File | ren -NewName { $_.name -replace "$", ".jpeg" }

edited Feb 26 '18 at 14:48

answered Feb 26 '18 at 14:32

Jeroen Mostert

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This gave this error for me: ren : Cannot rename because item at '*.' does not exist. – EBGreen Feb 26 '18 at 14:38
@EBGreen: correct, that only works with cmd. The PowerShell version is more involved, see edit. (Although there may be a more elegant way.) – Jeroen Mostert Feb 26 '18 at 14:42
You explained very well , as earlier i was trying to run it through powershell.. by using simple cmd 'ren ......' command... & That's why it didn't worked.... Cool – Rishabh Feb 27 '18 at 19:37

score 3 · Answer 2 · answered Feb 08 '21 at 14:51

"rename *. *.jpg" weirdly will bring up "The syntax of the command is incorrect." if there are no files without extensions in the location. I thought the command stopped working at first! So just letting people know if they have the same thing come up.

score 2 · Answer 3 · answered Feb 26 '18 at 18:56

You did everything correct but instead of *.* you ought to use *. as *.* searches for all files with all extensions but the former searches for all files with no extension and that is what you want. So here is your code:

rename *. *.something

You can refer to this answer for further help.

EBGreen · Answer 4 · 2018-02-26T14:53:06.957

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This is tested and works for me:

ls -file | ?{$_.extension -eq ''} | %{ren $_ ($_.name + '.jpeg')}

edited Feb 26 '18 at 14:53

answered Feb 26 '18 at 14:41

EBGreen

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score 1 · Answer 5 · answered Feb 27 '18 at 05:16

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try this:

Get-ChildItem "c:\temp" -file "*." | rename-item -NewName {"{0}.something" -f $_.fullname}

answered Feb 27 '18 at 05:16

Esperento57

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This is too hard to try... I just wanted a simple command...😄 if you understand, but thanks for the help – Rishabh Feb 27 '18 at 19:34
its a really command PowerShell, others proposition base on alias :) – Esperento57 Feb 27 '18 at 19:51
this was great for Powershell, thanks. – az1d Oct 02 '21 at 17:40

score 0 · Answer 6 · answered Feb 26 '18 at 14:33

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For me as simple as ren * *.jpeg worked.

answered Feb 26 '18 at 14:33

Alex

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this gave an invalid path for me – EBGreen Feb 26 '18 at 14:37
Double-checked: renaming of 3 files with no extension in Windows cmd did the job. – Alex Feb 26 '18 at 14:41
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Aaah...my mistake, I assumed powershell. You are correct that it will add the .jpeg to all the files. ***All the files*** including files with an extension. – EBGreen Feb 26 '18 at 14:43
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Yeah, to give to only without extension would be ren *. *.jpeg – Alex Feb 26 '18 at 14:45

score 0 · Answer 7 · answered Feb 26 '18 at 15:09

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A slight variation:

dir -filter *. -file | rename-item -NewName {"$($_.name)`.jpg"}

answered Feb 26 '18 at 15:09

Gene Laisne

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Rename files having no extension

7 Answers7