Batch rename sequential files by padding with zeroes

Question

I have a bunch of files named like so:

output_1.png
output_2.png
...
output_10.png
...
output_120.png

What is the easiest way of renaming t

Answer 1

I actually just needed to do this on OSX. Here's the scripts I created for it - single line!

> for i in output_*.png;do mv $i `printf output_%04d.png $(echo $i | sed 's/[^0-9]*//g')`; done