ORA-04044 Error in SQL statement

Question

Hi All,
I faced ORA-04044 in a SQL statement being written inside a shell script. I really don't know what is wrong with the script. Without shell variables is working ...
Here is the excerpt:
line=`sar -u 2 5 |tail -1`
var_io=`echo "$line" | awk '{print $6}'`
var_sys=`echo "$line" | awk '{print $5}'`
var_user=`echo "$line" | awk '{print $3}'`
var_idle=`echo "$line" | awk '{print $7}'`
sqlplus $ora_access <<EOF
select sysdate, a.hostid, a.inst_num, b.count1, c.count2, $var_user,$var_sys,$var_idle,$var_io
from dual ,
(select HOST_NAME hostid, INSTANCE_NUMBER inst_num from v$instance ) a,
(select count(sid) count1 from v$session where username is not null) b,
(select count(*) count2 from apps.fnd_concurrent_requests where phase_code ='R') c;
EOF
[b]Error Message:
SQL*Plus: Release 10.2.0.2.0 - Production on Thu Apr 10 02:20:53 2008
Copyright (c) 1982, 2005, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.2.0 - Production
With the Partitioning, OLAP and Data Mining options
SQL> 2 3 4 5 (select count(sid) count1 from v where username is not null) b,
ERROR at line 4:
ORA-04044: procedure, function, package, or type is not allowed here

Answer 1

Thanks a lot for instant reply. It worked!!
I forgot to use the escape character, but the error
message was not revealing anything :-(If you look carefully you could have spotted it:
SQL> 2 3 4 5 (select count(sid) count1 from[b] v where username is not null) b,