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    Notably python also supports the -u parameter to disable buffering. Commented Dec 19, 2019 at 21:52
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    Using grep(etc.) like this won't work. By the time you've executed long_running_command it's too late. It'll be buffered before it even gets to grep. Commented Jan 24, 2020 at 15:26
  • This is still buffered. what if one wants to see the line progress... Commented Feb 3, 2020 at 18:48
  • Should this work with grep --line-buffered pattern *many*many*files* | head? It looks like grep processes all the files before feeding the output lines to head Commented Feb 28, 2020 at 11:27
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    And here I thought I was a grep power user. Commented Jan 2, 2021 at 3:31