expect 脚本里判断交换机通断问题

lgskyxp

刚接触expect和shell,用expect和shell编了一个自动备份交换机配置的程序,现在想完善一下程序。首先想判断交换机是否通,然后再备份交换机的配置,试了好几种方法都不行,我的思路是当telnet 交换机超时20s时,交换机就算不通,下面是我写的其中一个程序，麻烦各位大侠帮我看看，哪里不对，还请指正，谢谢了！！

#!/usr/local/bin/expect -f

set timeout 20
set SWITCH_IP [lindex $argv 0]
set TELNET_PASSWORD [lindex $argv 1]
set EN_PASSWORD [lindex $argv 2]

spawn telnet $SWITCH_IP

expect  timeout {send_user "TIMEOUTSWITCH_IP";break}
"assword:"
  send "$TELNET_PASSWORD\r"
  expect "*>"
  send "en\r"
  expect "assword:"
  send "$EN_PASSWORD\r"
  expect "*#"
  send "copy running-config tftp://*.*.*.*\r"
  expect "*?"
  send "\r"
  expect "*?"
  send "\r"
  send "exit\r"
  expect eof
  exit