Calling oracle package Unix from shell scripts.

Hi,
Can anyone tell me how to call a oracle package from a Unix shell script? I want to pass some input parameters to package and it will return me the output which I want to use further in my shell script. I want to know the way to capture the output values in my shell script. Please send some shell script which will help me understand this concept.

Thanks in advance.

Regards,
Anil

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