madara@blackbox:/home/research$ sudo chmod -R uog+rwx /home/research/
madara@blackbox:/home/research$ ll
total 16
drwxrwxrwx 4 madara fortran 4096 Jun 14 02:23 ./
drwxr-xr-x 6 root   root    4096 Jun 11 15:25 ../
drwxrwxrwx 4 madara fortran 4096 Jul  1 14:12 code/
drwxrwxrwx 3 madara fortran 4096 Jun  4 16:09 Tinker/
madara@blackbox:/home/research$ sudo chmod -R uog-rwx /home/research/
madara@blackbox:/home/research$ ll
ls: cannot open directory .: Permission denied
madara@blackbox:/home/research$ sudo chmod -R g+rwx /home/research/
madara@blackbox:/home/research$ ll
ls: cannot open directory .: Permission denied
madara@blackbox:/home/research$ madara groups
madara: command not found
madara@blackbox:/home/research$ groups madara
madara : madara adm sudo lpadmin sambashare fortran
madara@blackbox:/home/research$