rename files

   for i in 2mD* ; do 
         mv $i test-"$i"; 
   done;


   for i in P* ; do 
      new=`echo $i | sed s/"Picture "/course-Picture_/g`; 
      mv "$i" $new; 
   done; 

File re-namer (http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-12.html#ss12.3)

File re-namer (http://tldp.org/HOWTO/Bash-Prog-Intro-HOWTO-12.html#ss12.4)