The first group indicates the read, write, and execute permissions for the file's owner.
第一组表示文件所有者的读、写和执行权限。
The second group indicates the read, write, and execute permissions for the file's group.
第二组表示文件组的读、写和执行权限。
For example, using chmod + RWX would set all the read, write, and execute permissions for a file.
例如，使用chmod + rwx将会设置文件的所有读、写和执行权限。
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