Question

I am writing some expect commands in bash.

原文:

#!/bin/bash  
set timeout -1  

expect -c "  

spawn telnet $IP $PORT1  
sleep 1  
send "
"  
send "
"  
expect Prompt1>  
interact timeout 20 {  
sleep 1  
}  

expect {  
Prompt2> {send "dir
" }  
}    

"

我用文字写的用意是,首先,在看到普姆普伦普1时,让我能够控制时,我会指挥一个特定的形象。然后等到Prompt2显示(这表明图像已经装上)。之后让我们执行更多的指挥系统。

在管理文字后,我可以进入互动模式,带我的形象。这个问题正在脱离遥远机器的互动模式,背弃控制。

我的傲慢:

expect: spawn id exp4 not open  
    while executing  
"expect -nobrace Prompt2 {send "dir
" }"  
    invoked from within  
"expect {    
Prompt2 {send "dir
" }  
}"

我如何能够这样做?

Answer 1

你的问题有两个方面......

你应当与明确的<代码>return互动,并在一定程度上了解你解除控制......在这种情况下,我使用三个加标和打入。
在你控制返回后,文字需要立即重新印发,这意味着你在返回控制之后所做的第一件事是发出另一个<编码><>>。我为我认为你重新努力做的事情做了编辑。

Example follows...

#!/bin/bash  
set timeout -1  

expect -c "  

spawn telnet $IP $PORT1  
sleep 1  
send "
"  
send "
"  
expect Prompt1>  
interact +++ return

send "
"
expect {  
Prompt2> {send "dir
" }  
}
"

Answer 2

return = fail

这对我来说不无所作为,因为就我而言,这并不是一件大事,只会使我再次面临同样的问题。我无法说明如何使其与在我发言之前的打印文本相匹配。

expect_out (to fix above solution) = fail

The manual says:

Upon matching a pattern (or eof or full_buffer), any matching and previously unmatched output is saved in the variable expect_out(buffer).

但我看不到工作(除我下文使用外,加上<代码>-indices<>/code>,使工作在那里进行,也没有设想如何使以前的产出纳入新的<代码>expect{......>。)

expect_user

解决办法,使用expect_user 我没有做任何工作,要么是因为我没有解释,要么没有使用我所希望的方式,那么,我不知道如何在我的实际预期档案中应用这一有限的例子。

my solution

So what I did instead was avoid the interactive mode, and just have a way to provide input, one line at a time. It even works for arrow keys and alt+..., (in dpkg Dialog questions) but not for simply <enter> sometimes (hit alt+y for <Yes> or alt+o for <Ok> for those in dpkg Dialog). (anyone know how to send an enter? not , but the enter key like dpkg Dialog wants?)

<代码>i 用户_spawn_id 部分意思是,它不只检查你的间谍程序,而是检查用户类型。这影响到以后的一切,因此,你使用<代码>expect_ subsequently。或将其置于其余部分,而不是expect_ before .-indices,从而使其能够读到与正常表述相当的部分。 expect_out(1,string) 是I想要的部分(除殖民地外)。

expect_after {
    -i $user_spawn_id
    # single line custom input; prefix with : and the rest is sent to the application
    -indices -re ":(.*)" {
        send "$expect_out(1,string)"
    }
}

采用<代码>expect_ subsequently,即该代码将适用于所有下列条目:expect。直至下一个<代码>expect_ subsequently。因此,你可以在卷宗中将这一条放在你通常的<代码>expect上。

and my case/purpose

I wanted to automate do-release-upgrade which does not properly support the usual Debian non-interactive flags (see here)...it just hangs and ignores input instead of proceeding after a question. But the questions are unpredictable... and an aborted upgrade means you could mess up your system, so some fallback to interaction is required.

Answer 3

Thanks Mike for that suggestion. I tweaked it a bit and adapted it to my problem.

修改法典:

expect Prompt1>  
interact timeout 10 return  
expect {  
timeout {exp_continue}  
Prompt2 {send "dir
" }  
}

The timeout 10 value is not related to the set timeout -1 we set initally. Hence I can execute whatever commands I want on Prompt1 and once keyboard is idle for 10 seconds then script gains control back.

即便在我面临另一个问题之后,在<代码>Prompt1之后,我还是要指挥,装上某个特定的形象。图像负荷大约为2分钟。即便有<代码> 定时--1 该书正等待<代码>Prompt2。甚至连经核实的电离网点都不会。但是,这方面的解决办法是增加“在预想声明内出现停职时继续留任”。

若要生效,请在预设的电话网络指挥之前张贴。

return = fail

expect_out (to fix above solution) = fail

expect_user

my solution

and my case/purpose

友情链接