[Pig-user] accessing pig params inside a UDF

I call a pig script

pig -param DATE=$date ~/bin/script.pig

inside of the pig script I filter records thru a perl udf


DEFINE parser `parser.pl` SHIP ( 'parser.pl' );

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raw_records = LOAD '/logs/$DATE';
parsed_recs = STREAM raw_records THROUGH parser;

A simple question "How do I access the date parameter inside of the perl
script?"

Thanks

Allan.