A_SYB_LOGIN indicates the user name under which you want to connect to the database system.
To connect to the database with the user name MYNAME, specify the following in the run time configuration file:
A_SYB_LOGIN MYNAME
If A_SYB_LOGIN is not set, on Windows the run time uses the value of your USER environment variable as your Sybase login name. On UNIX systems, the run time uses your UNIX login name as your Sybase login name. For this automatic login to succeed, you must have set up a user with the same name as your computer login name.
See also: A_SYB_PASSWD and Setting Up a User Account.