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ls -ld /usr
drwxr-xr-x 54  root sys  69 Apr  9 2018 /usr 
...
drwxr-xr-x 117 root bin 436 Sep 25 22:10 /usr/include
ls -ld /usr/include/sys
drwxr-xr-x 25  root bin 628 Sep 25 22:09 /usr/include/sys

ls -ld usr
drwxr-xr-x 3 root root   512 Jan 20 13:06 usr
...
drwxr-xr-x 3 root root   512 Jan 20 13:06 usr/include
ls -ld usr/include/sys
drwxr-xr-x 2 root root 11776 Jan 20 13:07 usr/include/sys