R - list files recursevely in specific subdirectories -

i trying list files organized following:

/volumes/macintosh hd 2/data/cmip5/historical/  ----clt -----------------------file1.txt -----------------------file2.txt ---------------models -----------------------file1.txt -----------------------file2.txt  ----hurs -----------------------file1.txt -----------------------file2.txt ---------------models -----------------------file1.txt -----------------------file2.txt  ----precip -----------------------file1.txt -----------------------file2.txt ---------------models -----------------------file1.txt -----------------------file2.txt  ----temp -----------------------file1.txt  -----------------------file2.txt  ---------------models -----------------------file1.txt  -----------------------file2.txt   ----wind -----------------------file1.txt  -----------------------file2.txt  ---------------models -----------------------file1.txt  -----------------------file2.txt  

what list, in 1 single list, files contained in subdirectories "models".

what tried, , did not work, command:

> sys.glob(file.path('/volumes/macintosh hd 2/data/cmip5/historical/', "models","*.txt")) character(0) 

is there straighforward way achieve r?

turns out way easier thought:

sys.glob('/volumes/macintosh hd 2/data/cmip5/historical/*/models/*.txt') 

it seems impossible find r can not do.