how to connect to sybase from Unix(AIX)

I have a script given below so can anyone explain me what it does?

echo "use $DSQUERY\n
go\n
insert into ff.SmartCareLogin
(username, password, userrole, fullname)
values
('$1', '$1', '$2', '$3')
go"|isql -Uff -P

what is the use of $DSQUERY and go.

When i am firiing isql command from aix server it gives me this error "Cannot access the sybase home directory, please check environment variable SYBASE or ~sybase

An error occurred when attempting to allocate localization-related structures�

What should i do?