> ls | grep -c .py That won't work if there are files with names like foo.py.txt. These will: ls | grep -c '.py$' or better, because less names to filter ou

> ls | grep -c .py That won't work if there are files with names like foo.py.txt. These will: ls | grep -c '.py$' or better, because less names to filter out: ls -l *.py | wc -l