简单的分组[]内是组名
mail.example.com
[webservers]
foo.example.com
bar.example.com
[dbservers]
one.example.com
two.example.com
three.example.com
[webservers]
www[01:50].example.com
[databases]
db-[a:f].example.com
分组usa的子组还可以是其它的组,例如[usa:children]中还可以包含southeast子组, [southeast:children]中还可以包含atlanta和releigh
[atlanta]
host1
host2
[raleigh]
host2
host3
[southeast:children]
atlanta
raleigh
[usa:children]
southeast
northeast
southwest
northwest