Upgrade shell about Oopsie

The machine’s name is Oopsie and IP is 10.10.10.28.I get some doubts when I’m reading the PDF.To upgrade the shell,we input these commands:

SHELL=/bin/bash script -q /dev/null
Ctrl-Z
stty raw -echo
fg
reset
xterm

I don’t know how these instructions work.Please help me,bro.