That's described in the update script: autoinstall files samples are in docs/autoinstall_samples/ folder in the ISPConfig tar.gz file.
Is there any intended workflow for autoinstaller updates? I noticed update.php is the one that understands the autoinstaller argument but the preceding scripts do not. There is some passing of $@ but update-runner.sh autolaunches update.php without arguments. And update.php is naturally not available before downloading. If there is not a workflow available, would it make sense to be able pass through some arguments for a completely automated version check, download & upgrade? That would allow something like this: sudo /usr/local/bin/ispconfig_update.sh --channel=stable --autoinstall=autoinstall.ini The alternative I am exploring being effectively a scripted download optionally implemented with version check duplicated from ispconfig_update.php
