Add the extension, jpg, to a lot of files

Question

I have a folder with a lot of folders with a lot of files and maybe more folders with more files, where some files lost their extension. I believe they are all jpgs, but I could be wrong. Any ideas how to re-add the extensions to all these files without doing it one by one?

I can do it on Windows 7 or Ubuntu 8.10.

Answer 1

You can do it through cmd on windows.

rename * *.jpg

Edit:
To apply to nested folders, you can use;

for /r %x in (*) do rename "%x" *.jpg

Answer 2

I did it this way

find . -type f -iregex ".*[^\(\.jpg\)]" -exec mv "{}" "{}.jpg" ";"

Answer 3

If using powershell is an option, then this post from SO should be exactly what you want.

Answer 4

On Linux

ls | while read file ; do mv $file $file.jpg; done

On Windows

I like to use Rename4u which is a freeware utility.

Answer 5

Extension Renamer does the job.

Answer 6

For Linux (or MSWindows w/CygWin)

If you wish to only add a suffix to files that are actually JPEGs, try this:

$ find . -type f  ! -name '*.jpg'  -print | while read f
> do case "$(file "$f")" in
>    *JPEG*) mv -iv "$f" "$f.jpg" ;;
>    esac
> done

Which will:

1. Print paths that are files w/o a _*.jpg_ suffix (find),
2. Check those files' contents (file $f),
3. For JPEG files, rename them with a _*.jpg* suffix.