sed是否阻止? [英] Is sed blocking?

问题描述

我对sed的印象没有任何阻挠，因为当我说时:

I had the impression sed wasn't blocking, because when I do say:

iostat | sed

sed在数据到达时对其进行处理，但是当我这样做时

sed processes the data as it arrives, but when I do

iostat | sed | netcat

然后sed阻止netcat.

我说得对吗?

推荐答案

sed当不打印到终端时将以缓冲模式工作.这意味着默认情况下它将尝试填充内部缓冲区，然后再进行任何处理和输出.

sed will work in buffered mode when it doesn't print to a terminal. This means that it will try to fill its internal buffer before doing any processing and output by default.

这样做是为了增加吞吐量，因为通常在管道中，您无需关心时间，而是希望在给定时间内处理尽可能多的数据.

This is done to increase throughput, because normally in a pipe you don't care about the timing, but want as much data processed in a given time as possible.

将-u传递给sed将使其不带缓冲地工作，因此以与输出到终端时相同的方式工作.

Passing -u to sed will tell it to work unbuffered, therefore working the same way it works when output goes to a terminal.

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