When you install SAP software, the software creates a system administrator account called "sa," which can use any database on an SAP ASE server, including master, with full privileges.
%SYBASE%\%SYBASE_OCS%\bin\isql -Usa -P -Sserver_name 1> sp_password default, new_password 2> goWhere:
For the greatest security, the password should contain at least six characters, and uses a combination of letters and numbers.