Shell Programming and Scripting

I have 2 files, and I want to count how many lines contain matching words.

Example:
file1

Code:

a_+b
a_+b_+c

file2

Code:

ab a_+b
a_+bc

I want to get 1, as the the first line of file1 is a substring of the first line of file2. While the second line isn't.

I suspect using sdiff, but not sure how to do it in way to mach a whole word (each word is separated by a space).

Your problem statement is ambiguous, but it's possible that the only thing you need is grep. Look at the -F, -f, and -c options.

Regards,
Alister

Hi Alister,

I looked at these options, but I am not so sure how to use them here.

So in other words, the problem is:
given line i in file1, is there a matching word in line i at file2?
If yes, count this line.

The following assumes that there are no tabs in each file. If there are, you'll need to choose an appropriate delimiter.

Code:

paste file1 file2 | awk -F'\t' 'index($2, $1)' | wc -l

If you or someone else requires every last bit of efficiency, the entire thing can be done within AWK. I optimized for simplicity.

Regards,
Alister