使用expect模拟telnet登录Cisco路由器，查询路由器状态

#!/usr/bin/expect

set timeout 15
set ip [lindex $argv 0]
set user [lindex $argv 1]
set password [lindex $argv 2]

#模拟登录
spawn telnet $ip

expect "Username:" { send "$user\r" }
expect "Password:" { send "$password\r" }
#执行sh process cpu命令，获取CPU使用率和进程数
expect ">" { send "sh process cpu\r" }
expect eof

while 1 {
    expect {
        "More" { send "\ " }
        "\[A-Za-z0-9]>" break
    }
}
#执行sh mem | include ^Processor命令，获取内存使用情况
send "sh mem | include ^Processor\r"

expect eof
#结束查询，退出telnet
send "exit\r"