#!/bin/bash
topdir=/var/test

## enter into the directory so we can get a non-pathed listing of directory names
cd $topdir
## Enable nullglob so it expands wildcard only if file exists, and doesn't expand to a literal "*"

shopt -s nullglob # enable
for file in ( * )
    do
    ## param substitute to strip the prefix off the file/dirname, and assign it as owner variable
    owner=${file//\.*/}
    chown -vR $owner $file
done