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  1. or download this
    perl -s -nle"BEGIN{open BIG};($undef,$l)=split;read BIG,$data,$l;print
+ $data" -- 
-BIG=bigfile.dat index.dat > outfile.dat
  2. or download this
    perl -sple"BEGIN{open BIG};($undef,$l)=split;read(BIG,$_,$l)" -- 
-BIG=bigfile.dat index.dat >outfile.dat