Batch renaming files in command line and Xargs

Question

So, I have the following structure:

.
..
a.png
b.png 
c.png

I ran a command to resize them

ls | xargs -I xx convert xx -res         


        

Answer 1

find ./xx -name "*.png" -print0 |sed 's/.png$//g'|xargs -0 -I% mv %.png %.jpg

I like to use following command

find ./xx -name "*.png" -type f|while read FILE; do
  mv "$FILE" "$(echo $FILE|sed -e 's/.png$/.jpg/')";
done