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

问题描述

在 bash/GNU 工具中是否有某种单行方式来阻止，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: 似乎我应该强调我希望在匹配字符串时结束进程.

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

推荐答案

感谢两位的回答，但重要的部分是进程阻塞直到找到，然后结束.我发现了这个:

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 不是很便携，但我只会使用 Red Hat Enterprise Linux 所以没关系.并超时:

-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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