期望命令不按预期工作

Question

我有以下代码段，我将连接到远程服务器并将dhcp config和dhcpd服务状态捕获到文件中。

#!/bin/bash

RET=$(expect -c "
        puts \"invoke SSH \"
        spawn ssh root@10.255.99.10

        expect {
        \"(yes/no)\" {send -- \"yes\n\"}
        \"assword:\" {send -- \"yt_xk39b\n\"}
        \"> \" {send -- \"\n\"}
        }

        expect {
        \"assword:\" {send -- \"yt_xk39b\n\"}
        \"> \" {send -- \"\n\"}
        }

        expect {
    \"> \"  {send -- \"cat /etc/dhcp/dhcpd.conf > /tmp/dhcp.txt\n\"}
    }

        expect {
    \"> \"  {send -- \"date\n\"}
        }

        expect {
    \"> \"  {send -- \"service dhcpd status >> /tmp/dhcp.txt\n\"}
        }

        expect {
        \"> \"  {puts \"finish.\"}
        }
")

以下是在调试模式下执行脚本

root@ac3tiams> sh -x /tmp/dummy_expect.sh
++ expect -c '
        puts "invoke SSH "
        spawn ssh root@10.255.99.10

        expect {
        "(yes/no)" {send -- "yes\n"}
        "assword:" {send -- "yt_xk39b\n"}
        "> " {send -- "\n"}
        }

        expect {
        "assword:" {send -- "yt_xk39b\n"}
        "> " {send -- "\n"}
        }

        expect {
    "> "  {send -- "cat /etc/dhcp/dhcpd.conf > /tmp/dhcp.txt\n"}
    }

        expect {
    "> "  {send -- "date\n"}
        }

        expect {
    "> "  {send -- "service dhcpd status >> /tmp/dhcp.txt\n"}
        }

        expect {
        "> "    {puts "finish."}
        }
'
+ RET='invoke SSH
spawn ssh root@10.255.99.10
|-----------------------------------------------------------------|
| This system is for the use of authorized users only.            |
| Individuals using this computer system without authority, or in |
| excess of their authority, are subject to having all of their   |
| activities on this system monitored and recorded by system      |
| personnel.                                                      |
| Anyone using this system expressly consents to such monitoring  |
| and is advised that if such monitoring reveals possible         |
| evidence of criminal activity, system personnel may provide the |
| evidence of such monitoring to law enforcement officials.       |
|-----------------------------------------------------------------|
Last login: Fri Feb  5 12:08:38 2010 from 10.255.99.10
root@ac3tiams>
root@ac3tiams>
root@ac3tiams> cat /etc/dhcp/dhcpd.conf > /tmp/dhcp.txt
date
root@ac3tiams> date
service dhcpd status >> /tmp/dhcp.txt
finish.'
root@ac3tiams>

这里我能够捕获dhcp conf，但无法捕获文件的dhcp服务状态。你能帮帮我吗？