Why does CentOS show a question mark instead of a user?

Question

linux

ls -l ./install
total 0
?--------- ? ? ? ?            ? footer.php
?--------- ? ? ? ?            ? header.php
?--------- ? ? ? ?            ? install.php
?--------- ? ? ? ?            ? licence.txt
?--------- ? ? ? ?            ? logo.php
?--------- ? ? ? ?            ? sql

Why does it show a question mark instead of a user and group name?

Answer 1

Most likely you do not have permission to execute in the install directory.
The "eXecute" flag for a directory means you can enter it.
The "Read" flag is to read the list, but this may not be enough.

Answer 2

See if this is it ?

Answer 3

check the file system, in most cases this is a sign of a dead fs.