Change ALL extensions in a folder

i have a folder of 7,000 images that need to have .jpg appended to all. how might i do this quickly so i can get them uploaded to Amazon store. Using MacPOS X and it doesn't care about the image extension.

Thanks for helping the temporarily brain dead. Google was not my friend on this search.

Are they currently jpg's or some other file type that need to be changed to jpg's?
I ask because you might just need to turn on "Show All File Type Extensions" in Finder preferences.
Or they might need to be converted as a batch and there are ways of doing that too.

MYmacROX said:

Are they currently jpg's or some other file type that need to be changed to jpg's?
I ask because you might just need to turn on "Show All File Type Extensions" in Finder preferences.
Or they might need to be converted as a batch and there are ways of doing that too.

Click to expand...

they are currently NOTHING or some have extensions which will be easy enough to change a handful rather than a gazillion

Did you try turning on Show all filename extensions?

You could cd to the directory and type this script in, hitting the enter key after each line...

ls > file
for i in `cat file`; do
mv $i $i.jpg
done

MYmacROX said:

Did you try turning on Show all filename extensions?

Click to expand...

Thanks yes i did. these files have no extensions currently because they weren't needed originally.

XJ-linux said:

You could cd to the directory and type this script in, hitting the enter key after each line...

ls > file
for i in `cat file`; do
mv $i $i.jpg
done

Click to expand...

have no idea how to do what you have suggested. that is similar to something i did long ago and far away on a pc. is this a terminal operation? sorry for being dense.

Yep. Just open the terminal.app and cd to the directory the files are in. Tpye pwd to double check you are in the correct directory.

Here's an example where I do this in a directory called /Users/username/test on four files named test1, test2, test3 and test4:

MacGyver:test username$ pwd
/Users/dcram/test
MacGyver:test username$ ls > file
MacGyver:test username$ for i in `cat file`; do
> mv $i $i.jpg
> done
MacGyver:test username$ ls
file.jpg test1.jpg test2.jpg test3.jpg test4.jpg
MacGyver:test username$ rm file.jpg
MacGyver:test username$ ls
test1.jpg test2.jpg test3.jpg test4.jpg
MacGyver:test username$

XJ-linux said:

Here's an example where I do this in a directory called /Users/username/test on four files named test1, test2, test3 and test4:

Click to expand...

THANK YOU, so can i assume that dos commands work in Terminal? i have been reluctant to work in terminal b/c of horror stories. Your script made it easy peasy!

Glad it worked. These are Unix commands, not DOS. Similar but different so please never try running DOS commands on a Mac.

XJ-linux said:

Glad it worked. These are Unix commands, not DOS. Similar but different so please never try running DOS commands on a Mac.

Click to expand...

so how would i modify the script for an if command.
if the extension is .doc don't change is what I am trying to do.
it is the wildcards that i don't understand.