bash 重复运行一个 shell 命令直到它失败？
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Repeatedly run a shell command until it fails?
提问by bradley.ayers
I've written a fuzzytest that fails unreliably. I've added some debug code, but now I want to run the test until it fails so I can gather the debug output.
我写了一个模糊测试，它不可靠地失败了。我添加了一些调试代码，但现在我想运行测试直到它失败，以便我可以收集调试输出。
I've setup the test so I can run it using:
我已经设置了测试，所以我可以使用以下方法运行它：
./runtest
My current solution is to write an untilfailscript:
我目前的解决方案是编写一个untilfail脚本：
#!/bin/bash
$@
while [ $? -eq 0 ]; do
$@
done
Then use it:
然后使用它：
untilfail ./runtest
Is there a simpler solution?
有没有更简单的解决方案？
回答by nneonneo
whiletakes a command to execute, so you can use the simpler
while需要一个命令来执行，所以你可以使用更简单的
while ./runtest; do :; done
This will stop the loop when ./runtestreturns a nonzeroexit code (which is usually indicative of failure).
这将在./runtest返回非零退出代码（通常表示失败）时停止循环。
To further simplify your current solution though, you should just change your untilfail script to look like this:
不过，为了进一步简化您当前的解决方案，您应该将 untilfail 脚本更改为如下所示：
#!/bin/bash
while "$@"; do :; done
And then you can call it with whatever command you're already using:
然后你可以用你已经在使用的任何命令调用它：
untilfail ./runTest --and val1,val2 -o option1 "argument two"
回答by Judd Rogers
If you don't want to wrap a complex pipe line into a shell script or function then this works:
如果您不想将复杂的管道包装到 shell 脚本或函数中，则可以这样做：
while true; do
curl -s "https:..." | grep "HasErrors.:true"
if [[ "$?" -ne 0 ]]; then
break
fi
sleep 120
done
The HTTP request in this case always returns 200 but also returns some JSON which has an attribute "HasErrors":true when there is an error.
在这种情况下，HTTP 请求总是返回 200，但也会在出现错误时返回一些具有属性“HasErrors”：true 的 JSON。
回答by Graham Leggett
Having had a similar problem in a system that had shell retry logic duplicated everywhere I made a dedicated tool to solve this called "retry":
在一个系统中遇到了类似的问题，该系统的 shell 重试逻辑随处重复，我制作了一个专用工具来解决这个问题，称为“重试”：
retry --until=fail ./runtest
A more complex example:
一个更复杂的例子：
retry --until=fail --message="test succeeded" --delay=1 ./runtest
Tool available from https://github.com/minfrin/retry.
可从https://github.com/minfrin/retry获得的工具。
