-u|-user 
This BRSPACE command option defines the user name and password used by the SAP tool to log on to the database. Since BRSPACE connects to the database as SYSDBA, you do not have to specify the user and password if the operating system user belongs to the dba group.
Syntax
-u|-user [<user>[/<password>]|/]
Default value: system/<default_password>
If you only enter -u , BRSPACE performs an interactive query of the user name and the password. You can enter the user name and the password separately (only enter the user name or the option -u <user>). BRSPACE then prompts entry of the password. In this case, the password is not displayed during entry, and does not appear in the process list.
This protects the DBA password.
In shell scripts, you can structure the call as follows:
brspace -c force -u -f dbshut <<END <user>/<password> END
However, use this command only if the option -c is active.
Note
If you are working with an OPS$ user, use the following call:
brspace -u / -c -f tsextend
In this case, BRSPACE tries to log on to the database as OPS$ user (see Oracle documentation and information in the SAP Service Marketplace). The OPS$ user must be defined in the database and have at least SYSDBA authorization. With this method, it is not necessary to specify the password when calling BRSPACE.
For setups with Oracle Real Application Cluster (RAC), you normally have to specify the database user and password. BRSPACE needs this to remotely manage the database instances.