Batch rename in OSX, add @2x to all files ending with .png

With the help of Mark Setchell's answer I was able to solve this with the following one-liner:

for f in *.png; do NEW=${f%.png}@2x.png; mv ${f} "${NEW}"; done;

Edit: flopr was right, should work now

Let me add something to the contribution. A more generic, multiple format (jpg, png, ..) and name "extension free" (pattern < name >@2x.< extension> ) one lined solution would be this:

for file in *; do mv "$file" "${file%.*}@2x.${file##*.}"; done

This works like a charm. Hope it helps

This should do it:

#!/bin/bash
ls *.png | while read f
do
    BASE=${f%.png}          # Strip ".png" off end
    NEW=${BASE}@2x.png      # Add in @2
    echo mv "$f" "${NEW}"   # Rename
done

Save it in a file called Add2x, then type:

chmod +x Add2x
./Add2x

When you have seen what it is going to do, remove the word "echo" so it actually does it.