file1.txt

	-> owner: acltest1:	rwx
	-> user:  acltest3:	rwx
	-> group: ---
	-> others: ---
	
-rwx------ 1 acltest1 users    0 Mar 14 13:36 file1.txt*

groupadd aclgroup1 			- create group
usermod -aG aclgroup1 acltest1		- add user to group
usermod -aG aclgroup1 acltest3		- add user to group

chgrp aclgroup1 file1.txt
chmod 770 file1.txt