bash 期望输出写入文件
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Expect output write to a file
提问by sauletasmiestas
I am trying to login to a remote device and write it`s output to a file. I came up with this code. But in rez.txt file i get line "(buffer)"
我正在尝试登录远程设备并将其输出写入文件。我想出了这个代码。但是在 rez.txt 文件中我得到了“（缓冲区）”行
My code is very basic - from manual, i do not know what is wrong:
我的代码非常基本 - 从手册中，我不知道出了什么问题：
/usr/bin/expect << SSHLOGIN
spawn ssh -l $user $host
set timeout 100
expect {
"assword: " {
send "$password\r"
}
}
expect {
">" {
send "?\r"
}
}
expect {
"?" {
puts [open rez.txt w] $expect_out(buffer)
}
}
expect {
">" {
send "exit\r"
}
}
SSHLOGIN
回答by Alaa Ali
It seems that you are calling Expect in a bash script.
您似乎是在 bash 脚本中调用 Expect。
The $expect_outpart of $expect_out(buffer)is being substituted by the shell. Since $expect_outis not set to anything, the Expect program is actually doing this:
的$expect_out部分$expect_out(buffer)正在被外壳取代。由于$expect_out未设置任何内容，Expect 程序实际上是这样做的：
puts [open rez.txt w] (buffer)
So it's basically putting the word (buffer).
所以它基本上是把这个词(buffer)。
To fix this, you need to escape $expect_outso that it is not expanded by the shell and passed correctly to Expect, like this:
要解决此问题，您需要转义，$expect_out以便它不会被 shell 扩展并正确传递给 Expect，如下所示：
puts [open rez.txt w] $expect_out(buffer)
回答by glenn Hymanman
expect's default matching mode is "glob"and ?is a special glob character. After you send "?", when expect sees a single character, your output file is written.
expect 的默认匹配模式是"glob"并且?是一个特殊的 glob 字符。发送“？”后，当期望看到单个字符时，将写入您的输出文件。
If you're expecting a literal ?, then you want to use exactmatching:
如果您期待一个字面量?，那么您想使用精确匹配：
expect -ex "?" {
puts [open rez.txt w] $expect_out(buffer)
}
