cat(1) *.md %7C tr -d -- %27-%7B%7D%5C%5B%5C%5D%28%29%3B%3D%3E%3C%27 %7C wc -w
concatenate files and print on the standard output
Concatenate FILE(s), or standard input, to standard output.

With no FILE, or when FILE is -, read standard input.
source manpages: cat