感叹号颠倒了比赛.从男人发现：

! expr True  if  expr  is false.  This character will also usually need

 -not expr
          Same as ! expr,but not POSIX compliant.

如果你想要它所属的组在输出中：

find /home ! -group test -printf "%p:%g\n"
./lots/573:root
...

有关使用find的更多信息：
How do I master the UNIX find command?