庆典：强制exec'd过程中有缓冲的标准输出 [英] bash: force exec'd process to have unbuffered stdout

问题描述

我已经有了喜欢的脚本：

I've got a script like:

#!/bin/bash
exec /usr/bin/some_binary > /tmp/my.log 2>&1

问题是， some_binary 将其所有日志记录到标准输出，和缓冲使得它如此，我只能看到几行块输出。当东西卡住，我需要看到最后一行说什么这是烦人。

Problem is that some_binary sends all of its logging to stdout, and buffering makes it so that I only see output in chunks of a few lines. This is annoying when something gets stuck and I need to see what the last line says.

有没有什么办法，使标准输出缓冲之前，我做了EXEC会影响some_binary所以它有更多有用的日志？

Is there any way to make stdout unbuffered before I do the exec that will affect some_binary so it has more useful logging?

（该包装脚本只设置Exec之前一些环境变量，所以在Perl和Python的解决方案也将是可行的。）

(The wrapper script is only setting a few environment variables before the exec, so a solution in perl or python would also be feasible.)

推荐答案

您可能会发现，自带的无缓冲脚本：//预期.sourceforge.net /> 期望 可能会有帮助。

You might find that the unbuffer script that comes with expect may help.

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