Logging into "SBA_81_DSN" as "SADMIN" ...
ODBC error 81 in SQLConnect:
(native error 0).
Unable to login using specified ODBC parameters.
The above error appear when you are trying to run the below command:
odbcsql /s SIEBEL8_DSN /u sadmin /p sadmin
Make sure the you set TNS_ADMIN in .profile or .bash_profile , TNS_ADMIN Should be Directed to Client32 bit , Copy tnsnames.ora from Database home to Client32
it will be like the following :