PASS ERROR RETURN CODES?

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Is there away to pass return codes and/or variables from Oracle to Unix
shell script? I have a batch job that will use SQL, export, and sqlloader.
Each piece is dependent on the success of each other. (If my export fails,
for what ever reason, I don't want SQL or PLSQL to run and so on). Is
DBPERL/ORAPERL the only answer? 
		     
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		     : Thomas Wood                      :


             	     : email:   tjwood_at_umich.edu 	:        


		     : DBA Analyst - KELLY Services INC :


		     : (810)244-4033                    : 


		     :..................................:

		     Opinions expressed are my own and  
		     not necessarily those of my employer