我如何将stderr重定向到一个文件？ [英] How can I redirect stderr to a file?

问题描述

到目前为止，我已经有了这个命令：

$ p $ find / -namereport *________ error.txt


解决方案

您可以像这样使用stderr处理程序 2
$ b

  find / -namereport *2> error.txt 
  

查看示例：

  $ ls a1 a2 
 ls：无法访问a2：没有这样的文件或目录< ---这是stderr 
 a1< ---这是stdin 
 $ ls a1 a2 2> error.txt 
 a1 
 $ cat error.txt 
 ls：can not access a2：No such file or directory< --- just stderr was stored 
  

阅读 BASH Shell：How To Redirect stderr标准输出（重定向st derr到一个文件），这些是处理程序：

 句柄名称描述
 0 stdin标准输入（stdin）
 1 stdout标准输出（stdout）
 2 stderr标准错误（stderr）
  

---

请注意与&> error.txt 的不同之处，它们会重定向stdin和stderr（请参阅或如何将stdout和stderr重定向到一个文件）：

  $ ls a1 a2&>错误.txt 
 $ cat error.txt 
 ls：无法访问a2：没有这样的文件或目录< --- stdin和stderr 
 a1< ---被存储了
  

What is the command required to redirect the standard error descriptor to a file called error.txt in unix?

I have this command so far:

find / -name "report*" ________ error.txt

解决方案

You can use the stderr handler 2 like this:

find / -name "report*" 2>error.txt

See an example:

$ ls a1 a2
ls: cannot access a2: No such file or directory  <--- this is stderr
a1                                               <--- this is stdin
$ ls a1 a2 2>error.txt
a1
$ cat error.txt 
ls: cannot access a2: No such file or directory  <--- just stderr was stored

As read in BASH Shell: How To Redirect stderr To stdout ( redirect stderr to a File ), these are the handlers:

Handle  Name    Description
0       stdin   Standard input   (stdin)
1       stdout  Standard output  (stdout)
2       stderr  Standard error   (stderr)

---

Note the difference with &>error.txt, that redirects both stdin and stderr (see Redirect stderr and stdout in a bash script or How to redirect both stdout and stderr to a file):

$ ls a1 a2 &>error.txt
$ cat error.txt 
ls: cannot access a2: No such file or directory  <--- stdin and stderr
a1                                               <--- were stored

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