http://gdncgijky3xvocpkq6xqk5uda4vsnvzuk7ke7jrvxnvyjwkq35iq.b32.i2p/posts/documentation/linux/302-ls-l-shows-question-marks-instead-of-permissions.html
Occasionally, when running ls -l within a directory, you might find that the output shows
question marks (?) instead of the usual permissions indicators:
[email protected]:~$ ls -l ~/testls: cannot access