Hide password

Hi experts,
I am working on AIX 5L, oracle database 10g on it.
we have some shell script running, this script connect with sql internally and fetch data from database and store output to a log file (output.log)
problem is those script contains system/apps password, which we need to protect to see....
#!/bin/sh
. $HOME/.profile
SID=TEST
sqlplus -s apps/xxxxxxx@TEST << EOF > /d01/oracle/output.log
select file_name, bytes/1024/1024 from dba_data_files;
exit;
EOF
please suggest a way to secure apps password.
Thanks in ADV!!!

Oracle provides the option to use Operating System based authentication also for regular users. For this it is necessary to create an Oracle user with the same name as the user OS login account, but with a prefix according to the OS_AUTHENT_PREFIX init parameter, which is OPS$ by default.
SQL> create user OPS$SCOTT identified by "tiger";
Login as user SCOTT
sqlplus /
same as:
sqlplus 'ops$scott/tiger'
Note: If the OS_AUTHENT_PREFIX gets changed to '', null, then the prefix for Oracle account names is no longer needed for OS authentication to work, but all accounts with the previous prefix cannot access Oracle anymore. When the identification has to be done in the database, do not create Oracle user accounts with the OS_AUTHENT_PREFIX. The init parameter REMOTE_OS_AUTHENT is set to FALSE by default; so remote users will be unable to connect without a password.

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