1. chgrp

chgrp 是change group的简写，主要的功能是改变一个档案的所属群组。

1.1. 命令格式

chgrp [OPTION]... GROUP FILE...
or: chgrp [OPTION]... --reference=RFILE FILE...

1.2. 命令功能

Change the group of each FILE to GROUP.

With --reference, change the group of each FILE to that of RFILE.

1.3. 命令参数

-R, --recursive: 常用进行递归的持续变更，即连同子目录下的所有档案、目录都变更成这个群组。

Original: operate on files and directories recursively

1.4. Example

chgrp staff /u:Change the group of /u to "staff".
chgrp -hR staff /u:Change the group of /u and subfiles to "staff".

1.5. 命令实例

更改test.txt档案的群组为root:

[root@localhost wangyuchuan]# ll
total 0
-rw-rw-r--. 1 wangyuchuan wangyuchuan 0 Jan 10 19:48 test.txt
[root@localhost wangyuchuan]# chgrp root test.txt 
[root@localhost wangyuchuan]# ll
total 0
-rw-rw-r--. 1 wangyuchuan root 0 Jan 10 19:48 test.txt

更改test.txt档案的群组为test:

[root@localhost wangyuchuan]# chgrp test test.txt 
chgrp: invalid group: `test'

从结果可以看到，要被改变的组名必须要在/etc/group 档案内存在才行，否则就会显示错误！

chgrp