输出未捕获到bash变量中 [英] Output not captured in bash variable

问题描述

我注意到，当尝试将命令的输出捕获到bash变量时，尽管没有完成变量分配，但仍将某些行打印在了终端上，但根本没有捕获到这些行.启用标题消息时， ssh-keyscan 是一个示例.另一个示例是来自Python SimpleHTTPServer 的访问日志.

I noticed that when trying to capture output of a command to a bash variable, some lines are not captured at all, although they are printed on the terminal when variable assigning is not done. One example is ssh-keyscan, when banner messages are enabled. Another example is access logs from a Python SimpleHTTPServer.

这些如何在终端上打印但不捕获到变量中?

How are these getting printed on the terminal but not captured to a variable?

推荐答案

fedorqui的评论中可能有原因...

Probably fedorqui have a reason in his comment...

在这种情况下，您可以使用重定向选项 2>& 1 将stderr重定向到stdout.像这样:

And in this case you could redirect stderr to stdout using redirect option 2>&1. Like this :

toto=$( ls tioto 2>&1 )
echo $toto
ls: cannot access tioto: No such file or directory

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