wc -l to count lines all txt files in folders and subfolders

Question

I have a few hundred txt files in several subfolders and I would like the count the lines in each txt file. I can do this for all txt files in the current directory by using:

for f in *.txt; do wc -l "$f"; done

which outputs:

[number] [txt filename]
[number] [txt filename]
[number] [txt filename]

Which is good. However, I don't want to to do this hundreds of times, navigating to each subfolder. The directory structure is:

-main
    -folder1
        textfile1.txt
        textfile2.txt
        textfile3.txt
    -folder2
        textfile4.txt
        textfile5.txt
        textfile6.txt
    -folder3
        textfile7.txt
        textfile8.txt
        textfile9.txt
...and so forth

Of note, the text files contain spaces and several dots before the .txt extension. Using the wc -l up above as written didn't produce any errors, though. Using terminal on a Mac running MacOS, which behaves like BSD for the most part.

Answer 1

find /the/path/to/search/ -name "*.txt" -exec wc -l {} \;

Answer 2

If the directory structure is constant, then wildcards can safely expand the list (assuming there aren't so many resulting files that you exceed the command line length):

wc -l main/*/*.txt

or

wc -l */*/*.txt

... depending on where you're starting from and what you want to include.

Answer 3

find /yourpath -type f -name "*.txt" -exec wc -l {} /dev/null \;