how to rename files with count

Posted by nkint on Ask Ubuntu See other posts from Ask Ubuntu or by nkint
Published on 2012-09-13T18:45:44Z Indexed on 2012/09/13 21:49 UTC
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bash

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rename

i have a directory like this:

randomized_quad015.png
randomized_quad030.png
randomized_quad045.png
randomized_quad060.png
randomized_quad075.png
randomized_quad090.png
randomized_quad1005.png
randomized_quad1020.png
randomized_quad1035.png
randomized_quad1050.png
randomized_quad105.png
randomized_quad1065.png
randomized_quad1080.png
randomized_quad1095.png
randomized_quad1110.png
randomized_quad1125.png
randomized_quad1140.png

and i want to rename the first files adding 0 in front of number, like:

randomized_quad0015.png

but i don't know how.. some help?

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