Error Handling with sql *plus from a shell script

Question

When I execute sql plus in a shell script with the wrong username/pass pair, the shell script hangs without terminating. What is the proper way to execute sql plus in a shell script that will catch a login failure and make sure the script doesn't hang?
Example:
We execute the following in our shell script:
sqlplus ${ORACLE_INST} @./sql/ftp_ledger_put.sql
Now if somebody comes along and alters the login then the script would hang. Is there a way to have the script exit gracefully?

Answer 1

Not the most elegant solution but.......
sqlplus <<EOD 2>&1 >some_log_file
user/pwd
@somescript
exit
EOD
Because sqlplus allows for 3 tries at log in if user/pwd is not valid it will try to use subsequent lines. Each will fail.
You have to look in some_log_file to determine success/failure
Ken