How can I flush stdout for a process under nohup?

Question

Is there a way to flush the buffer that nohup buffers stdout? From what I read in various places (eg. some place) is that I can modify the behaviour from within my programm. But that would be specific to each programm, and there are some where I would not want to mess with the code.

So I am looking for a general way to tell a 'nohuped' programm to flush stdout. Something on the commandline likeflush sdtout <PID>. Is there something like that? Or some sort of workaround?

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What kind of output does your program generate? (Line oriented with trailing newline?) What OS and programming language do you use? — MattBianco, Sep 16 '10 at 14:21
Line oriented with trailing newline. OS Linux, programming langue varies: bash, perl, python ... I was looking for something independent of the used language, but maybe I am on the wrong track there. — , Sep 16 '10 at 14:58

score 1 · Accepted Answer · answered Sep 16 '10 at 16:36

1

It's possible the (deceptively simple) unbuffer script that comes with expect may do what you're looking for.

answered Sep 16 '10 at 16:36

Dennis Williamson

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Thank you, that is pretty much what I was looking for. Very helpfull! – Sep 17 '10 at 13:59
So, would it be like `nohup unbuffer script.sh &`? – István Zachar Aug 14 '14 at 06:41
It should be `nohup unbuffer sh script.sh &`. For more details have a look at the comments in OP's question in https://stackoverflow.com/questions/28235928/telling-nohup-to-write-output-in-real-time – Kaushik Acharya Jan 27 '20 at 03:50

How can I flush stdout for a process under nohup?

1 Answers1