a nice su function

["E. Jay Berkenbilt" <ejb@xxxxxx>]

I like to use zsh when I'm root as well as when I'm myself, so I have
this little su function I threw together.  I post it here in case
others may find it useful and in case someone may point out a better
way to do something I've done here.  Basically, if I don't specify -
or -f I want -fc /bin/zsh appended to whatever I pass to su....  This
function seems to do the trick for me.

function su
{
   local add_args
   local args
   add_args=1
   args=($*)
   for i in $*; do
      if [ $i = "-" ]; then
	 add_args=0
      elif [ "${i:#-f*}" = "" ]; then
	 add_args=0
      fi
   done
   args=($*)
   if [ $add_args = 1 ]; then
      args=($args -fc /bin/zsh)
   fi
   command su $args
}