在 bash 中模拟按键
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Simulate key press in bash
提问by Wojciech Szabowicz
I have a question, Im having very simple script that starts anpther binary file in loop it looka like this:
我有一个问题，我有一个非常简单的脚本，它在循环中启动 anpther 二进制文件，它看起来像这样：
for (( i=0; \$i <= 5; i++ )) ; do
test.sh
done
Now problem is that after each execution test.sh asks me if I want to to override log something Like "Do you want to override log? [Y/n]"
现在的问题是，在每次执行之后 test.sh 都会问我是否要覆盖日志，例如“你想覆盖日志吗？[是/否]”
After that prompt appears scripts pauses and iteration is stopped until I manually press Y and that it continues until another prompt appears.
在出现该提示后，脚本暂停并停止迭代，直到我手动按 Y 并继续直到出现另一个提示。
To automate process can I simulate pressing "Y" button?
为了自动化过程，我可以模拟按下“Y”按钮吗？
回答by Aaron
I believe using yesmight be enough if your test.shscript doesn't use its standard input for other purposes : yeswill produce an infinite stream of lines of yby default, or any other string you pass it as a parameter. Each time the test.shchecks for user input, it should consume a line of that input and carry on with its actions.
我相信yes如果您的test.sh脚本不将其标准输入用于其他目的，使用可能就足够了：默认情况下yes会产生无限的行流y，或者您将其作为参数传递的任何其他字符串。每次test.sh检查用户输入时，它都应该使用该输入的一行并继续其操作。
Using yes Y, you could provide your test.shscript with more Ythan it will ever need :
使用yes Y，你可以为你的test.sh脚本提供Y比它需要的更多的东西：
yes Y | test.sh
To use it with your loop, you might as well pipe it to the loop's stdin rather than to the test.shinvocation :
要将它与您的循环一起使用，您最好将其通过管道传输到循环的 stdin 而不是test.sh调用：
yes Y | for (( i=0; i <= 5; i++ )) ; do
test.sh
done
回答by Aserre
Something like the following code snippet should work :
像下面的代码片段应该工作：
for (( i=0; i <= 5; i++ ))
#heredoc. the '-' is needed to take tabulations into acount (for readability sake)
#we begin our expect bloc
do /bin/usr/expect <<-EOD
#process we monitor
spawn test.sh
#when the monitored process displays the string "[Y/n]" ...
expect "[Y/n]"
#... we send it the string "y" followed by the enter key ("\r")
send "y\r"
#we exit our expect block
EOD
done
