directory names in a flat file

Hi,
Consider a flat file abc.conf contains some rows. Each row contains the directory name with full path. now I want to find a particular file in every directory which are mentioned in the abc.conf file. How it can be done through unix shell script.

If you are searching for abc.txt.

while read dir
do
echo "Searching in $dir"
find "$dir" -name abc.txt
done < abc.conf

Not tested.

find `cat abc.conf` -name filename.ext