> Thanks to John K Pate but i dont at the moment have time to sit and
> digest heaps of variables i just need to solve this one problem .
>
You want to be able to change "img_0004.jpg" to "img_0004_s.jpg", right?
You can use the built-in string replace functionality of bash to achieve
this (described in the first hit of that google search):
$ f=img_0004.jpg
$ echo $f
img_0004.jpg
$ echo ${f/.jpg/_s.jpg}
img_0004_s.jpg
==
John K Pate http://homepages.inf.ed.ac.uk/s0930006/
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