# uname -a
Linux hostname 4.9.0-4-amd64 #1 SMP Debian 4.9.51-1 (2017-09-28) x86_64 GNU/Linux


# ls -la
total 84
drwxr-xr-x  23 root root  4096 Nov 22 14:49 .
drwxr-xr-x  23 root root  4096 Nov 22 14:49 ..
drwxr-xr-x   2 root root  4096 Nov 13 11:20 bin
drwxr-xr-x   3 root root  4096 Nov 13 11:21 boot
drwxr-xr-x  15 root root  2900 Nov 22 15:43 dev
drwxr-xr-x  70 root root  4096 Nov 22 15:05 etc
drwx------   2 root root  4096 Nov 22 14:49 gandi
drwxr-xr-x   3 root root  4096 Nov 22 14:49 home
lrwxrwxrwx   1 root root    29 Nov 13 11:21 initrd.img -> boot/initrd.img-4.9.0-4-amd64
lrwxrwxrwx   1 root root    29 Nov 13 11:21 initrd.img.old -> boot/initrd.img-4.9.0-4-amd64
drwxr-xr-x  11 root root  4096 Jan 29  2017 lib
drwxr-xr-x   2 root root  4096 Nov 13 11:19 lib64
drwx------   2 root root 16384 Nov 13 11:18 lost+found
drwxr-xr-x   2 root root  4096 Nov 13 11:20 media
drwxr-xr-x   2 root root  4096 Nov 13 11:20 mnt
drwxr-xr-x   2 root root  4096 Nov 13 11:20 opt
dr-xr-xr-x 193 root root     0 Nov 22 14:49 proc
drwxr-x---   4 root root  4096 Nov 22 15:39 root
drwxr-xr-x  18 root root   620 Nov 22 15:05 run
drwxr-xr-x   2 root root  4096 Mar 17  2017 sbin
drwxr-xr-x   2 root root     0 Nov 22 14:49 srv
dr-xr-xr-x  13 root root     0 Nov 22 15:44 sys

# whoami
root

# mkdir /srv/data
mkdir: cannot create directory '/srv/data': Permission denied