Obtain files oyster.tar.gz, catalogs.tar.gz and atmospheres.tar.gz and unpack them (e.g. tar zxf oyster.tar.gz). Three directories are created, oyster, atmospheres, and catalogs.
Then, add the following three lines to your shell startup script (.tcshrc), substituting the correct path.
Please note the trailing slash. You also may have to specify the path to IDL. These environment variables have to be set by any user planning on using OYSTER. You can edit the startup procedure oyster.pro in the OYSTER home directory to enter default paths. This is the only place in the entire software where the path names to these directories need to be explicitly present if no environment variables are used.
Then to start OYSTER, simply type: oyster.
This procedure should work for LINUX and SOLARIS. OYSTER will detect your OS, and then know the path to the shared library and the binary JPL ephemeris file (which differs between Sun and PC based work stations), residing in directories linux and solaris under the main OYSTER directory.