从 tail -f 输出管道到 grep 后写入文件 [英] write to a file after piping output from tail -f through to grep

问题描述

我希望在将 tail -f 的输出通过管道传输到 grep 后写入文件.比如说，将 error_log "FreeSwitch.log" 中带有 "Playing:" 的所有行写入文件 "temp".

I'm looking to write to a file after piping output from tail -f through to grep. Say,write to a file "temp" for all lines with "Playing:" within in error_log "FreeSwitch.log".

 tail -f "/var/lof/freeswitch/freeswitch.log" | grep "Playing:" > temp

但不工作！这是一个centos 5.5

but not working ! It is a centos 5.5

推荐答案

也许您有缓冲问题?请参阅BashFAQ:什么是缓冲?

Maybe you have an issue with buffering? See BashFAQ: What is buffering?

你可以例如试试:

tail -f /var/lof/freeswitch/freeswitch.log | grep --line-buffered "Playing:" > temp

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