Hello. For example, I have a list like this inside a text file called "list.txt"

list.txt
-----------------------------------------------------
01-01-2009 15:50 grapes 2$
01-01-2009 15:56 tea 4$
04-01-2009 20:30 oranges 1$
05-01-2009 17:20 carrots 3$
05-01-2009 17:34 milk 5$
-----------------------------------------------------


I have another text file, "products.txt", full of lines like this:

products.txt
------------------------
car
grapes
table
chair
oranges
------------------------
I'm looking for a Bash command able to compare "list.txt" with "products.txt" and if a word is found in both lists, as "grapes and oranges", then Bash could print another list like this:

---------------------------------------------------------
01-01-2009 15:50 grapes 2$
04-01-2009 20:30 oranges 1$
---------------------------------------------------------

I'm able to do that, but using a macro in Excel, but I would like to do it with GNU/LInux and give up Windows.

I have been trying with awk, sed, but I don't know how to do it.

Thanks and excuse my very bad knowledge about bash and about English language.

grep -f products.txt  list.txt

Thank you very much for answering my question, dear jim mcnamara.

I'm afraid that code, grep -f, doesn't work very well because it confuses words like "car", located in the products.txt file, with words beginning with the letters car, like "carrots", located in the list.txt file.

Anyway I think that your code "grep -f" can facilitate my job, but I must brush up later all the files, by hand, to erase the possible mistakes written in the output list.

Again, thanks a lot for your answer.

$ awk 'NR==FNR{arr[$1];next}($3 in arr)' products.txt list.txt

Great! Problem solved!

Thank you very much, dear jaduks.