如何 "expect" 期望脚本中的变量？

Question

我正在尝试自动执行一些用于设置打印机的 telnet 命令。如果我手动操作，终端的预期输出如下：

Ebins-Mac-Mini:~ ebin$ telnet 192.168.4.104
Trying 192.168.4.104...
Connected to 192.168.4.104.
Escape character is '^]'.


Welcome to TSP100LAN TELNET Utility.
Copyright(C) 2008 Star Micronics co., Ltd.

<< Connected Device >>
   Device Model : TSP143 (STR_T-001)
   MAC Address  : 00:11:62:08:5B:F6

login: root         
password: ******

Hello root

=== Main Menu ===
  1) IP Parameters Configuration
  2) System Configuration
  3) Change Password
 96) Display Status
 97) Reset Settings to Defaults
 98) Save & Restart
 99) Quit

Enter Selection: 1

=== IP Parameters Menu ===
  1) Static
         IP Address      : 192.168.4.104
         Subnet Mask     : 255.255.255.0
         Default Gateway : 192.168.4.1
  2) Dynamic
         DHCP            : DISABLE
 99) Back to Main Menu

Enter Selection: 1

=== Static IP Address ===
  1) IP Address      : 192.168.4.104
  2) Subnet Mask     : 255.255.255.0
  3) Default Gateway : 192.168.4.1
 99) Back to IP Address Menu

Enter Selection:

直到二选我才勉强完成。但是，对于第二次选择，IP 地址：192.168.4.104 应该是我作为参数传递的变量。我如何 "expect" 这个 ??以下是我到目前为止的代码。

#!/usr/bin/expect -f
        set timeout 20
    set IPaddress [lindex $argv 0]

    set Username "root"
    set Password "public"
    spawn telnet $IPaddress
    expect "login: "
    send "$Username\r"
    expect "password: "
    send "$Password\r"
    expect {"Hello root\n\n"
        "=== Main Menu ===\n"
        "1) IP Parameters Configuration\n"
        "2) System Configuration\n"
        "3) Change Password\n"
        "96) Display Status\n"
        "97) Reset Settings to Defaults\n"
        "98) Save & Restart\n"
        "99) Quit\n\n"
        "Enter Selection:"
    }
    send 1
    send "\r"
    expect {"=== IP Parameters Menu ===\n"
        " 1) Static\n"
        " IP Address      : "
        "$IPaddress\n"
        " Subnet Mask     : 255.255.255.0\n"
        " Default Gateway : 192.168.4.1\n"
        " 2) Dynamic\n"
        " DHCP            : DISABLE\n"
        " 99) Back to Main Menu\n\n"
        " Enter Selection: "
    }
    send 1
    send "\r"

程序好像超时了，直接退出了。我怀疑我写错了期望行。任何帮助，将不胜感激。

Answer 1

不要"expect"满输出；相反，只需关注唯一标识您正在执行的任何内容的当前状态的序列。在您的情况下，这可能是菜单 headers，例如“=== Main Menu ===”。如果你事先知道每次显示这样那样的菜单时你都会选择X选项，那么这就是最好的处理方式。期望太多容易出错。

已编辑：这是一个示例片段：

expect "=== Main Menu ==="
send "1\r"
expect "=== IP Parameters Menu ==="
send "1\r"

如何 "expect" 期望脚本中的变量？

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