Tail logs and use grep to exclude specific lines

-1

I have this line that appears every minute in my log file:

2016-03-29 21:52:46,226 INFO     200 GET /api/ping (0.0.0.0) 0.34ms

I want to tail this log file without showing these lines.

I tried:

tail -f log.txt | grep -v "ping"

Bruno

Posted 2016-03-30T15:02:57.827

Reputation: 165

Do you mean that what you tried don't work? – Sébastien VALSEMEY – 2016-03-30T15:17:33.263

1The solution has been written a couple of times in the context of other shell commands. You should look for "stdbuf" in the upper right corner of this web page. – Gombai Sándor – 2016-03-30T15:18:48.510

What is the problem? Just tried this on my machine and it works as expected. echo "..GET /api/ping (0.." | grep -v "ping" yelids a 1 result with no matches. – Matt Clark – 2016-03-30T15:29:39.937

@MattClark echo sthing is easy because its output is finished and flushed. A continuous pipe means buffering which is usually a friend but when waiting for the buffer to fill and flush means an impact on the process, it's an ugly enemy. Luckily, it can be tamed with stdbuf among a couple of options. – Gombai Sándor – 2016-03-30T19:25:45.300

even still, tail -n 0 -f test | grep -v "ping" and run this in another terminal echo "..GET /api/ping (0.." >> test still result in no output. I've tested this on 4 different unix distros, and cygwin on windows. All have the same expected behavior. – Matt Clark – 2016-03-30T20:40:48.603

Answers

0

You could do something like this:

tail -F ~/Your.log | while read LINE;do

if [[ ! "$LINE" =~ "ping" ]]; then

   echo $LINE 

done
fi
done

Rhyuk

Posted 2016-03-30T15:02:57.827

Reputation: 605

Asked: 2016-03-30T15:02:57.827

Viewed: 517 times

Active: 2016-03-30T15:22:20.333