Question

I need a scrip to replace .png with @2x.png How can I do this for all file names in a directory?

Answer 1

Assuming bash:

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

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Explanation:

Line 1:

for f in *.png; do

For loop. Iterates over all filenames in the current directory that match the glob pattern *.png, sets $f to each name in turn, and executes the body of the loop.

Line 2:

mv "$f" "${f%.png}@2x.png"

Executes the mv tool. The first arg is just "$f", which is the file you want to rename. The second arg is a two-step process:

1. ${f%.png} evaluates to the filename with the extension .png stripped off.

2. Following the stripped filename is @2x.png, which just appends that string back onto the filename.

Line 3:

done

Terminates the for loop.