if [ $# -ne 1 ]
then echo 'syntax: swap fast or swap slow' ; exit
fi
if [ $1 = fast ]
then rm /xenix ; ln /xenix.f /xenix ; rm /dev/swap ; ln /dev/swap.f /dev/swap
elif [ $1 = slow ]
then rm /xenix ; ln /xenix.s /xenix ; rm /dev/swap ; ln /dev/swap.s /dev/swap
else echo 'syntax: swap fast or swap slow'
fi