#/bin/bash

 filedata="data"
 fileblack="black"
 fileclean="clean"
 dos2unix $filedata $fileblack

 cat $filedata | sort > $filedata.sort
 cat $fileblack | sort > $fileblack.sort

 comm -23 $filedata.sort $fileblack.sort > $fileclean

 unix2dos $fileclean