How to assigne a value to UNIX variable inside a oracle plsql block

Hi All,
How can a assign a value to my UNIX (Shell script)variable inside a oracle procedure and read it back from shell script.
Can you please help me out regarding this.
Thanks in advances.
Regards
Krishna Shrivas.

SQL> create or replace function setvar return varchar2 is
2 begin
3 return('SOMETHING');
4* end;
SQL> /
Function created.
SQL> get readvar
1 select setvar from dual
2 /
SETVAR
SOMETHING
SQL> Disconnected from Oracle Database 10g Enterprise Edition Release 10.1.0.3.0 - Production
With the Partitioning, OLAP and Data Mining options
[oracle@linuxas tmp]$ cat readvar.sh
MYVAR=`sqlplus -s scott/tiger @readvar`
echo $MYVAR | awk '{print $3}'
[oracle@linuxas tmp]$ ./readvar.sh
SOMETHING
[oracle@linuxas tmp]$

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How to assigne a value to UNIX variable inside a oracle plsql block

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