How to stop script

I have a script and can be run on commandline like:  

> sqlplus <usrname>/<password>@TEST @import.sql
   

However, I want to check database name at the beginning of import.sql. I knew "select name from v$database" can obtain database name. But how can I stop the script if I found it is not TEST database? In import.sql, it is like:  

drop user A cascade;
create user A ....;
host imp A/[EMAIL PROTECTED] file=a.dmp full=yes; // some PL/SQL ...  

Thanks!  

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