Scheduling a Cron Job

Note that if you are wanting to schedule a script to run with Cron and execute SQLPLUS, you may have to make the script aware of the user environment variables like this:
#!/bin/sh
if [ -f ~/.bashrc ]; then
. ~/.bashrc
fi
sqlplus -S perfstat/perfstat @query.sql > outfile.txt
To run a script with Cron automatically:
  1. Log in to the OS as the user you want to execute the job.
  2. Run "crontab -e" to edit the crontab configuration file
  3. Add a line to the configuration file to specify the info about the job.
The crontab file is organized like this:
*   *   *   *   *  /path/for/CommandToBeExecuted
-   -   -   -   -
|   |   |   |   |
|   |   |   |   +----- day of week (0=Sunday, 1=Monday, ... ,6=Saturday)
|   |   |   +------- month (1=Jan, ..., 12=December)
|   |   +--------- day of month (1 - 31)
|   +----------- hour (0 - 23)
+------------- min (0 - 59)

Example 1: Run example1.sh every day at 10:30am and 10:30pm:

30 10,22 0 0 0 /home/example1.sh

Example 2: Run example2.sh Monday-Friday at 7:00pm:

* 19 * * 1-5 /home/example1.sh