$ grep -ir ifup /etc/rc?.d/
/etc/rc0.d/S35networking:if ! [ -x /sbin/ifup ]; then
/etc/rc0.d/S35networking: ifup -a
/etc/rc0.d/S35networking: ifup -a
/etc/rc6.d/S35networking:if ! [ -x /sbin/ifup ]; then
/etc/rc6.d/S35networking: ifup -a
/etc/rc6.d/S35networking: ifup -a
/etc/rcS.d/S40networking:if ! [ -x /sbin/ifup ]; then
/etc/rcS.d/S40networking: ifup -a
/etc/rcS.d/S40networking: ifup -a
/etc/rcS.d/S39ifupdown:[ -x /sbin/ifup ] || exit 0
/etc/rcS.d/S39ifupdown:[ -r /etc/default/ifupdown ] && . /etc/default/ifupdown
/etc/rcS.d/S39ifupdown:# Note: The state file location is hardcoded in ifup|ifdown
/etc/rcS.d/S39ifupdown: # Doing this also signals that ifupdown is available for use
/etc/rcS.d/S39ifupdown: if [ -x /etc/init.d/ifupdown-clean ]; then
/etc/rcS.d/S39ifupdown: /etc/init.d/ifupdown-clean start
/etc/rcS.d/S18ifupdown-clean:# ifupdown-clean
/etc/rcS.d/S18ifupdown-clean:[ -r /etc/default/ifupdown ] && . /etc/default/ifupdown
/etc/rcS.d/S18ifupdown-clean:# Note: The state file location is hardcoded in ifup|ifdown
/etc/rcS.d/S18ifupdown-clean: echo -n "Cleaning up ifupdown..."