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linux - How to 'grep' a continuous stream?

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菜鸟教程小白 发表于 2022-4-23 21:07:19 | 显示全部楼层 |阅读模式 打印 上一主题 下一主题

Is that possible to use grep on a continuous stream?

What I mean is sort of a tail -f <file> command, but with grep on the output in order to keep only the lines that interest me.

I've tried tail -f <file> | grep pattern but it seems that grep can only be executed once tail finishes, that is to say never.



Best Answer-推荐答案


Turn on grep's line buffering mode when using BSD grep (FreeBSD, Mac OS X etc.)

tail -f file | grep --line-buffered my_pattern

It looks like a while ago --line-buffered didn't matter for GNU grep (used on pretty much any Linux) as it flushed by default (YMMV for other Unix-likes such as SmartOS, AIX or QNX). However, as of November 2020, --line-buffered is needed (at least with GNU grep 3.5 in openSUSE, but it seems generally needed based on comments below).

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