在Bash中将标准错误重定向为null-“日期：无效的日期“从不”” [英] Redirect standard error to null in Bash - "date: invalid date `Never'"

问题描述

我需要将以下错误重定向到/ dev / null文件。

I require the following error to be redirected to the /dev/null file.

a=$(date -d "Never" +%s)  > /dev/null 2>&1
date: invalid date `Never'

输入到date命令的date实际上是通过有时会获得从不的变量传递的。在这种情况下，将显示上述消息中所示的错误，需要将其消除。

The date that is input to the date command is actually being passed through a variable which sometimes acquires "Never". In such a case, an error is shown as shown in the above message which is required to be suppressed.

是否存在另一种将输出重定向到空文件的方法？

Is there another method to redirect the output to the null file?

推荐答案

您当前正在做什么：将分配的输出重定向到 / dev / null 。

What you are doing currently: redirecting the output of the assignment to /dev/null.

您想做什么：重定向<$ c的错误输出 $ c> date 命令到 / dev / null

What you want to do: redirecting the error output of the date command to /dev/null

a=$(date -d "Never" +%s 2>/dev/null)

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