# Ideally the parsing would take the "[can]" section into
# account, but this should work for now.
-interface=$(grep ^port= $CONF |cut -d= -f2 |tr -d '"')
+interface=$(sed -nr '/\[can\]/,/\[/{s/^port *= *//p}' $CONF)
if [ -n "$interface" ]; then
echo "Checking $interface"
if ! ifconfig $interface >/dev/null 2>&1; then