[joel@fedora-native ~]$ mkdir temp
[joel@fedora-native ~]$ chown :wheel temp
[joel@fedora-native ~]$ chmod g+s temp/
[joel@fedora-native ~]$ chmod 770 temp
[joel@fedora-native ~]$ touch toto
[joel@fedora-native ~]$ ll toto
-rw-rw-r--. 1 joel joel 0 Jul  8 11:48 toto
[joel@fedora-native ~]$ mv toto temp
[joel@fedora-native ~]$ ll temp
total 0
-rw-rw-r--. 1 joel joel 0 Jul  8 11:48 toto