#!/usr/bin/ruby
require 'pty'
require 'expect'
ip = ARGV[0]
outlet_id = ARGV[1]
# Spawn new PTY session
PTY.spawn( 'telnet ' + ip ) do |read,write,pid|
write.sync = true
$expect_verbose = true
read.expect(/User Name : $/,3)
write.print "#######\r"
read.expect(/Password : $/)
write.print "#######\r"
read.expect(/^>.*/,2)
write.print "1\r" #Type 1 for "Device Manager"
read.expect(/^>.*/,2)
write.print "2\r" #Type 2 for "Outlet Management"
read.expect(/^>.*/,2)
write.print "1\r\r" #Type 2 for "Outlet Control/Configuration"
read.expect(/^>.*/,2)
write.print "
#{outlet_id}\r\r" #
Enter the required outlet number"
read.expect(/^>.*/,2)
write.print "1\r" #Select 1 to control the outlet"
read.expect(/^>.*/)
write.print "3\r" #Select 3 for immediate reboot"
read.expect(/cancel.*:/) #Select 1 to control the outlet"
write.print "YES\r" # outlet has now been power cycled
read.expect(/Press to continue.*/) #press enter to return to menu
write.print "\r"
read.expect(/^>.*/)
end # end pty spawn

那一句不懂？
建议看入门书