eg:  exfields.pl file.gz field1,field2,field3

##</code><code>##

steve  37	ma    
jeff   35	ca
ben	30	tn

##</code><code>##


##</code><code>##


##</code><code>##

steve  37	ma
jeff   35	ca
ben    30	tn

##</code><code>##

steve  guitar  
jeff   bass
ben	drums

##</code><code>##

steve  37	ma    guitar
jeff   35	ca    bass
ben	30	tn    drums

##</code><code>##

merge.pl file1 field,field file2 field

##</code><code>##

file1 field,field

##</code><code>##

%hash_1 =    steve => '37' AND 'ma'
	         jeff =>  '35' AND 'ca'
             ben  =>  '30' AND 'tn' 		

##</code><code>##

file2 field

##</code><code>##

%hash_2 =  steve => 'guitar'
	       jeff =>  'bass'
           ben  =>  'drums'