Jenkins console output not in realtime

Question

Pretty new to Jenkins and I have simple yet annoying problem. When I run job (Build) on Jenkins I am triggering ruby command to execute my test script.

Problem is Je

Answer 1

Each of the other answers is specific to one program or another, but I found a more general solution here:

https://unix.stackexchange.com/a/25378

You can use stdbuf to alter the buffering behavior of any program.

In my case, I was piping output from a shell script through tee and grep to split lines into either the console or a file based on content. The console was hanging as described by OP. This solved it:

./slowly_parse.py login.csv |tee >(grep -v LOG: > out.csv) | stdbuf -oL -eL grep LOG:

Eventually I discovered I could just pass --line-buffered to grep for the same result:

./slowly_parse.py login.csv |tee >(grep -v LOG: > out.csv) | grep --line-buffered LOG: