Adding the same comment to every code file in a Visual Studio solution

# Process all .cpp and .h files under the directory tree at $PROJECTROOT
# To add other file types, add more "-o -name *.ext" clauses.
# $COPYRIGHTFILE is the file containing your copyright message
COPYRIGHTLENGTH=$(wc -l $COPYRIGHTFILE)
for file in $(find $PROJECTROOT -name *.cpp -o -name *.h); do
    if diff <(head -n $COPYRIGHTLENGTH $file) $COPYRIGHTFILE; then
        (cat $COPYRIGHTFILE; cat $file) > /tmp/file
        mv /tmp/file $file
    fi
done

1:         static void Main(string[] args)
 2:         {
 3:             string path = "C:\...TopLevelFolder";
 4:             string copyright = "//Copyright © 2011 Rex Cardan, Ph.D";
 5:             string[] files = Directory.GetFiles(path, "*.cs",
 6:                                          SearchOption.AllDirectories);
 7:             foreach (string file in files)
 8:             {
 9:                 if (file.Split('\')[file.Split('\').Length-1]!= "AssemblyInfo.cs")
 10:                 {
 11:                     using (StreamWriter sw = File.AppendText(file))
 12:                     {
 13:                         sw.WriteLine("rn");
 14:                         sw.WriteLine(copyright);
 15:                         //Normalize Line Endings
 16:                         sw.WriteLine("rn");
 17:                     }
 18:                 }
 19:             }
 20:         }