gistfile1.txt

root@c208540c41e2:/var/lib/nagios3# ls -ld  /var /var/lib /var/lib/nagios3 /var/lib/nagios3/rw
drwxr-xr-x 64 root   root   4096 Sep 19 15:48 /var
drwxr-xr-x 45 root   root   4096 Sep 19 15:48 /var/lib
drwxrwxr-x 21 nagios nagios 4096 Sep 30 15:24 /var/lib/nagios3
drwxrwx---  2 nagios nagios 4096 Sep 30 16:24 /var/lib/nagios3/rw
root@c208540c41e2:/var/lib/nagios3# su - www-data -c "/bin/bash"
bash: no job control in this shell
www-data@c208540c41e2:~$ id
uid=33(www-data) gid=33(www-data) groups=33(www-data),104(nagios),1000(nagcmd)

# This works well
www-data@c208540c41e2:~$ cd /var/lib/nagios3/
# but if I try to go into 'rw', this is what I get
www-data@c208540c41e2:/var/lib/nagios3$ cd /var/lib/nagios3/rw/
bash: cd: /var/lib/nagios3/rw/: Permission denied
www-data@c208540c41e2:/var/lib/nagios3$