Sometimes, just to make sure all files are private, a commandsudo chmod -R 000 .If we want to change back the permissions back to normal, what command can be used?sudo chmod -R 777 .will not work because it makes some files that are not supposed to be executable become executable.  The executable flag is need for directories to be able to be accessible.
After changing all file permissions to 000, how to change it back to normal?
chmod