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hm, my man page of grep says:

-f FILE, --file=FILE
Obtain patterns from FILE, one per line. The empty file con-
tains zero patterns, and therefore matches nothing.

So i...

Could you post a sample from the second file?

I'd do that by telling grep the previous and next characters must either be beginning of line, end of line, or non-numeric.

Once you've done that you can grep entire lists of things with -f.
...

That is Dangerous Backticks (http://partmaps.org/era/unix/award.html#backticks): for x in `cat address.list`

Use a while loop instead and grep with -w option:
while read x
do
echo "results...