CentOS Offline Installation expect

This is what Dr. Li Xuejin told me. 0.0 He said there is no unknown, but I do not know ...
First of all, expect is a free programming language used to communicate between automated and interactive tasks without human intervention.
It's easy to download and not install with Yum in the same networked virtual machine as the system version.

[Root@drguo/]# Yumdownloader expect
[Root@drguo ~]#-Yumdownloader tcl

Tcl is expect dependent, so it's all down. It will be downloaded to the current directory, the file is in RPM format, copy to the server installation can be.