结合尾巴-F和json [英] Combine tail -F and json

问题描述

我的日志文件每行有一个json对象. 我使用[json] [1]通过以下方式获取人类可读的输出:

My log files have one json object per line. I use [json][1] to get a human readable output via

cat mylog.log | json -a field1 field2

现在我想拥有

tail -F mylog.log | json -a field1 field2

用于连续输出.但这似乎不是 工作时，外壳只是挂了.如果我使用&| 避免缓冲问题，输出就像 我只运行cat.

for a continuous output. But this seems not to work, the shell simply hangs. If I use &| to avoid buffering issues, the output is as if I only run cat.

mylog.log看起来像这样:

{"field1": entry1a, "field2": entry2a, "field3": entry3a}
{"field1": entry1b, "field2": entry2b, "field3": entry3b}

有什么建议吗?

[1] https://github.com/trentm/json

推荐答案

它看起来像json

It's looks like json first loads the whole stdin into a buffer and only then processes the data, but you should still be able to achieve stream processing by calling it for each of the lines added to the log file, something like this:

tail -F mylog.log | while read line; do echo "$line" | json -a field1 field2; done

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