02-18-2008
not knowing what the real data looks like, but...
How about?
This would effectively break up everything into 26 smaller files based on the first character of the file, and assuming it is lowercase. (Or, depending on the format of your data, could be ten numeric groups, etc...)
for outch in a b c d e f g h i j k l m n o p q r s t u v w x y z
do
cat fileb | grep ^"$outch" > fileb_"$outc"
done
while read zf
do
leadch=$(echo $zf | cut -c1-1)
now do lookup to appropriate file
use the just determined $leadch variable
and write if found/not found, as you like
done <filea
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