Linux：阻塞，直到文件中的字符串匹配（“tail + grep with blocking”） [英] Linux: Block until a string is matched in a file ("tail + grep with blocking")

问题描述

在bash / GNU工具中是否有一种单行方式阻塞，直到文件中有匹配的字符串？理想情况下，超时。我想避免多行循环。

Is there some one-line way in bash/GNU tools to block until there's a string matched in a file? Ideally, with timeout. I want to avoid multi-line loop.

更新：好像我应该强调，当字符串是匹配。

Update: Seems like I should have emphasize that I want the process to end when the string is matched.

推荐答案

感谢这两个答案，但重要的部分是该过程阻塞直到找到，然后结束。我发现这个：

Thanks both for answers, but the important part was that the process blocks until found, then ends. I found this:

grep -q 'PATTERN' <(tail -f file.log)

-q 并不太方便，但我只会使用Red Hat企业Linux，所以没关系。
并且超时：

-q is not much portable, but I will only use Red Hat Enterprise Linux so it's ok. And with timeout:

timeout 180 grep -q 'PATTERN' <(tail -f file.log)

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