Linux shell 命令末尾的“/dev/null”是什么意思
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What does "/dev/null" mean at the end of shell commands
提问by Sepehr Samini
What is the difference between the following commands?
以下命令有什么区别？
ssh myhostname "command1; command2;...commandn;" 2>/dev/null
ssh myhostname "command1; command2;...commandn;"
what does
2>mean?what does
/dev/nullmean? I read somewhere that result of command will be write to file/dev/nullinstead of console! Is it right? It seems strange for me that the name of file benull!
是什么
2>意思？是什么
/dev/null意思？我在某处读到命令的结果将写入文件/dev/null而不是控制台！这样对吗？对我来说，文件的名称是null!
采纳答案by Malvolio
2>means "redirect standard-error" to the given file.
2>意味着“重定向标准错误”到给定的文件。
/dev/nullis the null file. Anything written to it is discarded.
/dev/null是空文件。任何写入它的东西都会被丢弃。
Together they mean "throw away any error messages".
它们一起的意思是“丢弃任何错误消息”。
回答by Madbreaks
'/dev/null' essentially means "into the void", discarded. The 2you mention refers to error output, where it should be directed.
'/dev/null' 本质上的意思是“进入虚无”，被丢弃了。在2你提到的是指错误输出，它应该被引导。
回答by Ed Heal
2> means sending standard error to something
2> 表示向某物发送标准错误
/dev/null means a bin
/dev/null 表示一个 bin
回答by BrenanK
1) Pipe everything on standard error to /dev/null (so ignore it and don't display it)
1) 将标准错误上的所有内容通过管道传送到 /dev/null （因此忽略它并且不显示它）
2) Dev null just points to nowhere, pipe anything to that, and it disappears.
2) Dev null 只是指向无处，通过管道将任何东西传递给它，然后它就消失了。
回答by Jimmy
1 is stdout. 2 is stderr.
1 是标准输出。2 是标准错误。
Then sometimes you find 2>&1, that means redirecting stderr to stdout.
然后有时您会发现2>&1，这意味着将 stderr 重定向到 stdout。
