Script mail can't write to file

Question

stuERR.bat
<<<<<<
cd /home/ajax/stu_roles
date > ~/stu_roles/log/stu_roles_bat.log
cat ~/result/.test_stat.pw | sqlplus [email protected] @DDT_role_report >> ~/stu_roles/log/stu_roles_bat.log
SUBJECT="Roles Report"
EMAIL_ADDR="[email protected]"
cat ~/stu_roles/DDT_role_report.csv | mailx -s "$SUBJECT" "$EMAIL_ADDR"
DDT_role_report
<<<<<<<<<<
SET HEADING OFF
SET TRIMOUT OFF
SET SERVEROUTPUT on
SET ECHO OFF
SET FEEDBACK OFF
SET PAGESIZE 0
SPOOL DDT_role_report.csv
select * from test2 where STATUSSTRING='ERROR';
SPOOL OFF;
what is wrong

Answer 1

Ugly. Lots of moving parts.
Much simpler to write just PL/SQL code to run the SQL, format the e-mail, and then send it via UTL_MAIL or UTL_SMTP. The resulting PL/SQL code resides in the database (stored procedure/package). Can be scheduled for execution as and when needed using DBMS_SCHEDULER or DBMS_JOB. Is fully portable to other operating systems (the PL/SQL code is o/s independent). The code is subjected to Oracle security and auditing and backup and recovery. It does not have on foot in o/s land and the other in db land.
Keep it simple.