Many Oracle administrators are concerned about hard-coding passwords
in scripts and crontabs. Oracle 9i from the command line allows a simple
logon like this: oracle@bighost $ sqlplus '/ as sysdba'
This provides a simple method to run scripts without a password.
Another method is to create and externally authenticated account, such as
ops$oracle. Then log on with: oracle@bighost $ sqlplus /
When using either method, remember to set up the shell environment
variables before running sqlplus.