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I've got a process that I want to inspect with strace, but since it's printing out a lot of stuff, I would like to sample only a few lines every X seconds from it. Is there any way of doing that with bash or similar?

For example:

strace -p 123456 | "print out most recent 80 lines every 2 seconds"
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1 Answer 1

up vote 3 down vote accepted

Yes:

strace -p $PID >$PID.log &
watch tail -n80 $PID.log >$PID-sample.log &
tail -f $PID-sample.log

or just watch tail -n$LINES $PID.log if you don't need to scroll back through the sampled log.

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