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[ root@c486ed67350e:~ ]$ ls -l /etc/sudoers.d/                                                                                                                                                                                               
total 8.0K
-r--r----- 1 root root 958 Mar 12 16:27 README
-rw-r--r-- 1 root root  41 May 21 18:53 st2
[ root@c486ed67350e:~ ]$ cat /etc/sudoers.d/README                                                                                                                                                                                           
...
# Note that there must be at least one file in the sudoers.d directory (this
# one will do), and all files in this directory should be mode 0440.
...