如何使用Bash禁止命令的所有输出? [英] How can I suppress all output from a command using Bash?

问题描述

我有一个Bash脚本，该脚本运行带有参数的程序.该程序输出一些状态(执行此操作，执行此操作...).这个程序没有任何选择可以保持安静.如何防止脚本显示任何内容?

I have a Bash script that runs a program with parameters. That program outputs some status (doing this, doing that...). There isn't any option for this program to be quiet. How can I prevent the script from displaying anything?

我正在寻找类似Windows的回声" .

I am looking for something like Windows' "echo off".

推荐答案

以下内容将标准输出发送到空设备(位存储桶).

The following sends standard output to the null device (bit bucket).

scriptname >/dev/null

如果您还希望将错误消息发送到那里，请使用以下命令之一(第一个消息可能不适用于所有shell):

And if you also want error messages to be sent there, use one of (the first may not work in all shells):

scriptname &>/dev/null
scriptname >/dev/null 2>&1
scriptname >/dev/null 2>/dev/null

并且，如果您想记录消息但看不到消息，请用实际文件替换/dev/null，例如:

And, if you want to record the messages, but not see them, replace /dev/null with an actual file, such as:

scriptname &>scriptname.out

为了完整起见，在Windows cmd.exe(其中"nul"等同于"/dev/null")下，它是:

For completeness, under Windows cmd.exe (where "nul" is the equivalent of "/dev/null"), it is:

scriptname >nul 2>nul

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