To install Adaptive Server Enterprise on Xserve running in a headless mode (without a monitor), you have two options:
Use the Apple Remote Desktop, which gives you a desktop interface to the Xserve.
Use the shell command /usr/sbin/installer
(refer
to man installer for details).
To install using the command line installer, first place the disk image containing the Adaptive Server installation package on a disk volume accessible to the Xserve. Then, type the command:
% installer -pkg /Volumes/Sybase/Sybase_ASE_1251.pkg -target /
Where the pathname to the installation package (.pkg) identifies the exact location of the file. The target is the root device (“/”).
You must provide a complete pathname to the installation package.