How to assign ORACLE_SID to variable in sqlplus

Would like to have the following under sql plus prompt:

1) It worked  
>@test.sql ORACLE_SID
where in test.sql, I can put
define ORACLE_SID=&1
...
I do not want this.

2) Since once logging in database, the ORACLE_SID can be obtained from
select name from v$database;

Is there any way to assign the SID into a define statement in sqlplus?
For example,

>@test.sql
...
define ORACLE_SID = ...
--get the SID via whatever.
...
use the SID in other sql statements.
jl66Asked:
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slightwv (䄆 Netminder) Commented:
Look into NEW_VALUE


col name new_value mySid;
select name from v$database;
prompt My Database sid is &mySid

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jl66Author Commented:
Exactly what I need. Thank you so much.
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