Calling SqlPlus From Unix Shell Script

In this post we will discuss how we can call sqlplus from within a unix shell script. Here is a post on how to read concurrent program parameters from shell script and this is a continuation to that.
The syntax to call a SQLPLUS from shell script is

sqlplus -s $login <<-EOF
set feedback off
set serveroutput on
declare
--  variable declarations
....
....
begin
--sql statements..
....
....
end;
/
exit
EOF

In the syntax above,
$login is the unix variable which stores username/password.
EOF is the identifier to indicate start and end of sql statements.
UNIX variables can be referred inside sqlplus by using $ sign. Any dbms_output.put_line statements are printed in the log file if script is run through concurrent program.