PREUN

/bin/sh

if [ "$1" = "0" ]; then
	while read SHNAME; do
		[ "$SHNAME" = "/bin/ksh93.static" ] ||\
		echo "$SHNAME"
	done
	mv -f /etc/shells.new /etc/shells
fi

POSTIN

/bin/sh

if [ ! -f /etc/shells ]; then
	echo "/bin/ksh93.static" > /etc/shells
else
	while read SHNAME; do
        	if [ "$SHNAME" = "/bin/ksh93.static" ]; then
                	HAS_KSH_STATIC=1
	        fi
	done < /etc/shells
	[ -n "$HAS_KSH_STATIC" ] || echo "/bin/ksh93.static" >> /etc/shells
fi