Reading variables from a shell script

Question

i was wondering if it is possible to enter variables from a shell script that an sql file can use:
ex:
shell script file
#!/bin/ksh
stty -echo
read pwd?"Enter password for user: "
echo
stty echo
read var?"Please enter value for variable: "
echo
$ORACLE_HOME/bin/sqlplus user/$pwd @TEST.sql
sql file TEST.sql
set serveroutput on
set verify off
spool out.log
update table set parameter_value = '$var' where parameter_name = 'X';
commit;
exit;
spool off;
i tried that and it seems its updating my table with "var" and not what the user entered that is the bind variable $var
am i missing something?

Answer 1

if user hits enter (which means null) can the program
not end and ask the user to enter another value?Try this way :
while :
do
        echo -n "Please enter value for variable: "
        read VAR
        if [ "$VAR" ]; then
                break
        else
                continue
        fi
done