Update Manager is similar in function to YUM & APT. It is consistent across platforms & also works in sandbox mode.
./pgedge um <command> [parameters] [options]
list - Display available/installed components
update - Retrieve new list of components & update ctl
install - Install a component (eg pg16, spock32, postgis, ...)
remove - Un-install component
upgrade - Perform an upgrade of a component
clean - Delete downloaded component files from local cache