retrieve directory name from a $file variable

Hi

I started this script, in which I would like to get the directory name where $file is located, and put it in a variable. I only want the name of the directory, not the path...

Can someone help ?

Cheers

Terence

#!/bin/sh
thumbdir=/Users/terencepires/Documents/Skydog/Images/for_web/thumb
 
for file in $(find . -type f -iname "*.jpg" -o -iname "*.tif" -o -iname "*.tiff" -o -name "*.gif"); do 
 
#imageMagick format and size conversion 
convert $file -quality 10 -resize 25% $thumbdir$file
done

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