Bash scripting

> > Can anyone tell me how, in a bash script, I can move the contents of
> > variable $2 to variable $1 and so on?  I'm writing a bash script to
> > update some stuff but I'd like to be able to type
> > script.sh noblah noit nothat
> > but everything is defaulted yes.
> > Currently., my script is something like
> > case "$1" in
> >     noblah)
> >         echo Not doing blah.
> >         $1="$2"
> >     ;;
> >     *)
> >         echo Doing blah;
> >     ;;
> > esac
> > case "$1" in
> >     nothis)
> >         echo Not doing this.
> >         $1="$2"
> >     ;;
> >     *)
> >         echo Doing this
> >     ;;
> > esac