/dev/sda6        32G  1.6G   29G   6% /
/dev/sda9        91G   16G   71G  19% /usr
tmpfs           3.9G   57M  3.8G   2% /tmp
/dev/sda1        16G  819M   14G   6% /boot
/dev/sda5       1.4T  635G  738G  47% /home
/dev/sda8        85G  4.5G   76G   6% /var
tmpfs           788M   16K  788M   1% /run/user/500
root@telaviv1:/home/shlomif # sudo -u shlomif -i
Everyone can be taught to sculpt: Michelangelo would have had to be
taught how not to.  So it is with the great programmers.
[shlomif@telaviv1 ~]$ ls -ld /proc
drw-rw-rw- 285 root root 0 Feb 11  2016 /proc
[shlomif@telaviv1 ~]$ ls -ld /proc/cgroups
ls: cannot access '/proc/cgroups': Permission denied
[shlomif@telaviv1 ~]$ stat /proc/cgroups
stat: cannot statx '/proc/cgroups': Permission denied
[shlomif@telaviv1 ~]$ umask
022
[shlomif@telaviv1 ~]$
───────────────────────────────────────────────────────────────────────────────
-rw-rw-rw-  1 root       root                     0 Mar 17 11:45 zoneinfo
root@telaviv1:/proc # cd
root@telaviv1:~ # ls -ld /proc
drw-rw-rw- 286 root root 0 Feb 11  2016 /proc/
root@telaviv1:~ # ls -ld /proc/cgroups
-rw-rw-rw- 1 root root 0 Mar 17 11:46 /proc/cgroups
root@telaviv1:~ # stat /proc/cgroups
  File: /proc/cgroups
  Size: 0               Blocks: 0          IO Block: 1024   regular empty file
Device: 5h/5d   Inode: 4026531855  Links: 1
Access: (0666/-rw-rw-rw-)  Uid: (    0/    root)   Gid: (    0/    root)
Access: 2020-03-17 11:46:41.786516343 +0200
Modify: 2020-03-17 11:46:41.786516343 +0200
Change: 2020-03-17 11:46:41.786516343 +0200
 Birth: -
root@telaviv1:~ # umask
0022
root@telaviv1:~ #