diff -r b59fba19738f -r 4a0bff167159 hws/hw04.tex
--- a/hws/hw04.tex	Thu Nov 05 12:17:16 2015 +0000
+++ b/hws/hw04.tex	Fri Nov 06 08:51:53 2015 +0000
@@ -40,8 +40,10 @@
 \item What does it mean that the program \texttt{passwd} has the
   \texttt{setuid} bit set? Why is this necessary?
 
-\item Which permissions does the program \texttt{login}
-normally have and why is this needed?
+\item Under Unix (for example BSD Unix, MacOSX) the \texttt{login} 
+  programm has the setuid bit set. Why is this needed? In Linux
+  \texttt{login} does \emph{not} have the setuid bit set. What are
+  the consequences of this choice?
 
 \item The variable \texttt{PATH} is a shell variable in UNIX which
   lists all directories that should be automatically searched for a