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If I have a pipe like cat /dev/somedevice | grep 'test' that output commands, like for example echo 'test 17', the commands appear in realtime (everytime /dev/somedevice delivers some line). If I however pipe the commands to sh, they won't be invoked imediately because of pipe buffering. So 

cat /dev/somedevice | grep 'test' | sh

wont execute commands in realtime.

Is there any other way that would? With xargs or something?

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  • So you want sh to interprete each line separately as soon as each is fed to sh?
    – theoden8
    Aug 6, 2015 at 13:23
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    See my answer to a very similar question cat /dev/smd | stdbuf -o0 grep 'test' | stdbuf -o0 sh
    – Felipe Lema
    Aug 6, 2015 at 16:17
  • The stdbuf method works, so the answer to this question is almost the same as to "how to get unbuffered pipes" questions all around.. Maybe you post a similiar answer?
    – dronus
    Aug 10, 2015 at 10:28

1 Answer 1

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Try --line-buffered to make a continuous stream:

cat /dev/somedevice | grep --line-buffered 'test' | sh
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  • This is nice, but works for example pipe only (using grep). I would favor a more general answer like in the comments above.
    – dronus
    Aug 10, 2015 at 10:29

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