not sure what exactly are you looking for..if i understood correctly..u may want to do something like this-

for file in adc_earnedpoints*.txt
do
datestr=`echo $file | cut -d. -f2`
new=`echo $file | cut -d. -f1,3`

mv $file $new
#call informatica session with the datestr
done

cheers,
Devaraj Takhellambam