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tail -fto provide continuous input to a program andteeto process the output. If you were still in need of an answer, I would have suggested simplifying the chain to<in.json jq '.f1' >out.jsonso that you could narrow down what's causing it.tail -f logfile | grep 'foo bar' | awk ...tailbit came about from efforts to break the pipe down (run the first command, tee and redirect to file, tail that, pipe to next command, redirect to file, etc) and run it continuously in sections. The<is a good tool to keep in mind though.