什么是"/dev/null"?在shell命令末尾的意思 [英] What does "/dev/null" mean at the end of shell commands

问题描述

以下命令之间有什么区别?

What is the difference between the following commands?

ssh myhostname "command1; command2;...commandn;" 2>/dev/null
ssh myhostname "command1; command2;...commandn;" 

1. 2>是什么意思?

/dev/null是什么意思?我在某处读取到命令结果将写入文件/dev/null而不是控制台！这样对吗?对我来说，文件名是null！

what does /dev/null mean? I read somewhere that result of command will be write to file /dev/null instead of console! Is it right? It seems strange for me that the name of file be null!

推荐答案

2>表示将重定向标准错误"重定向到给定文件.

2> means "redirect standard-error" to the given file.

/dev/null是空文件.写入其中的所有内容都将被丢弃.

/dev/null is the null file. Anything written to it is discarded.

它们的共同含义是丢弃任何错误消息".

Together they mean "throw away any error messages".

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