This was stripped from from http://www.webgui.org/wiki/wre-installation for clarity

You can set up the WRE to start automatically at system boot by running the following commands after the WRE is installed:

Mandriva Linux

Red Hat Linux

This note applies to all linux' that use chkconfig to setup services. These include RHEL, Fedora, Mandrake, SuSE, CentOS, and others.

ln -s /data/wre/sbin/services/redhat/webgui /etc/init.d/webgui
chkconfig --add webgui
chkconfig webgui on

Debian Linux

ln -s /data/wre/sbin/services/redhat/webgui /etc/init.d/webgui
update-rc.d webgui defaults

ubuntu

How to Include WebGUI in Ubuntu Server Startup

SELinux

Mac OS X

ln -s /data/wre/sbin/services/osx/org.webgui.wre.plist /Library/LaunchDaemons/

FreeBSD

ln -s /data/wre/sbin/services/freebsd/webgui /usr/local/etc/rc.d/webgui
echo "webgui_enable=YES" >> /etc/rc.conf.local