import export oracle schema using sqlplus

i am currently using oracle 10g and i want to export my schema using sqlplus . .. i have done it using
db administrative page. is there anyway that i could call the import/export procedure using sqlplus and overwrite the values for jobdescription, log file etc..

can any one provied me the complete pl/sql code and the ways to export or any related link would be very
helpfull.

thanks in advance

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