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Old 10-16-2012, 07:41 AM   #16
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Originally Posted by oneindelijk
And if you use tail -f file | sed -u 's/ /Xx/g' ?
Yeah, it gets stuck, that's what I meant by reproduce the problem.

Originally Posted by Snark1994
I assume this is because 'tail' is waiting for a newline before passing anything through the pipe
I thought so too, but then I found that tail -f kermit.log | cat outputs everything. I think it's because sed operates on lines, so it has to wait for newline before it starts processing. Furthermore:

# this hangs (awk operates on lines by default):
tail -f kermit.log | gawk 1
# changing the record separator to multiple spaces does give output:
tail -f kermit.log | gawk -vRS=' +' 1
Old 10-16-2012, 07:57 AM   #17
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Originally Posted by ntubski View Post
I thought so too, but then I found that tail -f kermit.log | cat outputs everything.
Well, dang. So it does.


buffer accumulation, buffer flush, stdbuf, tail grep buffer

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