Bash Script Help Please...

[ilovepoker]

Ok i need some help here people...
I have 30k+ images without extensions...
I used a program called GPRename to give each of my images a random name, because some of the names were very long so they were causing problems, and it deleted the file extension on all my pictures now I'm having difficulty opening the images on my windows computer and my phone (no prob on linux)
I was wondering if any of you know of a program/script I can use that would add the correct file extension to the end of all the images
I was thinking of a script using the bash command "file" but i'm not very good with bash so I would have no idea how to do this for multiple files

[dasein]

man rename

[saulgoode]

Try the following code in a copy of one of your directories containing the extensionless files.

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for f in *; do mv -v "$f" "$f.$( ( file "$f" | cut -s -d\:  -f 2 | cut -s -d\  -f 2 | tr [:upper:] [:lower:] ) )";done

[aicardi]

I was wondering if any of you know of a program/script I can use that would add the correct file extension to the end of all the images

If all the extensions were the same as in (.JPG, .jpg, etc...) you could add that extension back easy enough.
Example of before renaming:

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$ ls
imagefile1.jpg imagefile2.jpg

Is now:

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$ ls
NEWNAME1 NEWNAME2

Within a COPY of one of the directories you could add an extension like this. Adding .jpg as an example.:

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for old in *; do mv $old `basename $old `.jpg; done; 

Your listing will now be:

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$ ls
NEWNAME1.jpg NEWNAME2.jpg

Note that the extension will be added to every file including directories.