A silent or unattended installation requires no user interaction; all installation configuration information is taken from the response file. This is useful when you want multiple identical installations, or to fully automate installation.
./setup -silent -options /responseFileName\ -W SybaseLicense.agreeToLicense=true
where responseFileName is the name of the file containing the installation options you chose. The -W option specifies that you agree with the Sybase License Agreement text.
Except for the absence of the GUI screens, all actions of the installer are the same, and the result of an installation in silent mode is exactly the same as one performed in GUI mode with the same responses.