How to automate a silent installation of a Splunk universal forwarder on Solaris using the PKG file?

Hello fellow Splunkers, Have any of you been able to install Splunk Universal Forwarder on Solaris using the PKG file? I'm trying to script it so that it is installed silently without any interactions. Has anyone been able to achieve this? Might be a basic one, but can't seem to find that answer anywhere.