使用期望脚本发送命令输出并存储在文件中 [英] Using an expect Script to send the output of a command and store in a file

问题描述

我正在尝试将通过spawn ssh远程窗口运行的命令的输出存储到本地主机中，这是我的新手，无法弄清楚我哪里出了错。
我的代码：

 ＃！/ bin / bash 
 
而读取行
 do 
 / usr / bin / expect<< EOD 
 spawn ssh mininet @ $ line 
期望 assword： 
 send- mininet\r 
设置输出[打开 outputfile.txt a +] 
期望 mininet @ mininet-vm：* 
发送- ls\r 
设置结果$ expect_out（buffer）
发送 \r 
放入$ output $ outcome 
 close $ output 
期望 mininet @ mininet-vm：* 
发送-退出 
互动
期望eof 
 EOD 
完成< read_ip.txt 
  

我遇到错误

 
期望：生成ID exp6无法打开
在执行
时期望 mininet @ mininet-vm：* 
 

请任何机构帮助我

解决方案

您在shell heredoc中有期望程序。 Shell将在启动期望之前中扩展变量。您必须从外壳保护Expect的变量。

一种方法是使用带引号的 heredoc，然后将shell变量传递给环境以期望：

 ＃！/ bin / bash 
导出主机##环境变量
而读主机
 
 / usr / bin / expect<<'EOD'##注意这里的引号
 spawn ssh mininet @ $ env（host）##从环境中获取值
期望 assword： 
发送- mininet\r 
设置输出[打开 outputfile.txt a +] 
期望 mininet @ mininet-vm：* 
 send- ls\r 
设置结果$ expect_out（buffer）
 send \r 
放置$ output $ outcome 
 close $ output 
期望 mininet @ mininet-vm：* 
发送- exit\r 
期望eof ##既不想交互又要期望eof 
 EOD 
完成了< read_ip.txt 
  

在Heredoc终止符周围加上单引号，意味着整个Heredoc的行为就像一个单引号的字符串，而Expect的变量留待期望处理。 p>

您可能还会调查期望的 log_file 命令：您可以随意启用和禁用日志记录，就像手动操作一样在这里。

Hi I am trying to store the output of a command run through a spawn ssh remote window into my local host, I am new to expect and am not able to figure out where I am wrong. My Code:

#!/bin/bash

while read line
do
        /usr/bin/expect <<EOD
        spawn ssh mininet@$line
        expect "assword:"
        send -- "mininet\r"
        set output [open "outputfile.txt" "a+"]
        expect  "mininet@mininet-vm:*"
        send -- "ls\r"
        set outcome $expect_out(buffer)
        send "\r"
        puts $output "$outcome"
        close $output
        expect  "mininet@mininet-vm:*"
        send -- "exit\r"
        interact
        expect eof
EOD
done <read_ip.txt

I am getting the error

expect: spawn id exp6 not open
    while executing
"expect  "mininet@mininet-vm:*""

Please can any body help me on this code.

解决方案

You have your expect program in a shell heredoc. The shell will expand variables in the heredoc before launching expect. You have to protect expect's variables from the shell.

One way is to use a 'quoted' heredoc, and pass the shell variable to expect through the environment:

#!/bin/bash
export host                            ## an environment variable
while read host
do
    /usr/bin/expect <<'EOD'            ## note the quotes here
        spawn ssh mininet@$env(host)   ## get the value from the environment
        expect "assword:"
        send -- "mininet\r"
        set output [open "outputfile.txt" "a+"]
        expect  "mininet@mininet-vm:*"
        send -- "ls\r"
        set outcome $expect_out(buffer)
        send "\r"
        puts $output "$outcome"
        close $output
        expect  "mininet@mininet-vm:*"
        send -- "exit\r"
        expect eof                 ## don't want both "interact" and "expect eof"
EOD
done <read_ip.txt

Putting single quotes around the heredoc terminator means the whole heredoc acts like a single quoted string, and expect's variables are left for expect to handle.

You might also investigate the expect log_file command: you can enable and disable logging at will, much as you are doing manually here.

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