Append a command to the end of file /etc/init.d/boot.local to be executed after booting.

echo “command” >> /etc/init.d/boot.local

Example: echo "/opt/zend/bin/zendctl.sh start" >> /etc/init.d/boot.local

Original source: http://workingbinary.com/2011/05/how-to-run-command-after-boot-on-opensuse/