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 enhance your understanding of