该命令是改变目录或者文件的权限，对于UGO这三种不同的用户，他们的权限都可以使用该命令设置，看看此命令将会提升你对chmod的进一步了解-The command is to change the directory or file permissions, for UGO three different users, their permissions can be set using this command, see the chmod command will further enhanc