here is some sample data:

file1.txt

123
456
789
[download]

file2.txt

123 string 1
111 string 1
script should skip this line
222 string 1
333 string 1
456 string 2
444 string 2
it should skip this line as well
555 string 2
666 string 2
789 string 3
777 string 3
also skipping this line too
888 string 3
999 string 3
[download]

and the stuff that gets extracted from file 2 are based off of file1's contents. iIt takes the data from file 1 and gets the first match it finds in file 2, then gets the right side column and compasres that against the entire file.

Output:

123 string 1
111 string 1
222 string 1
333 string 1
456 string 2
444 string 2
555 string 2
666 string 2
789 string 3
777 string 3
888 string 3
999 string 3
[download]

Thanks for the tips btw :)
Will updated OP

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