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---

you need to use a $ to evaluate a variable
e.g.
for i in 1 2 3 4 5
do
echo vol000$i
done

if you are using bash shell

T
On 28 Mar 2007, at 14:36, Mustafa Cavusoglu wrote:

> I am trying to write a shell script to interpolate the ASL
> data. my file names are vol0000.nii.gz, vol0001.nii.gz up
> to vol0099.nii.gz
>
> I only want to average the even and odd files corrsponding
> to tag and control images and cancel the first and the last
> file and subtract from ecach other. How can use a variable
> in the file name in order to create a loop to do theis such
> as
>
> i=1
> vol000i
>
> thanks