C语言 如何将控制台输出重定向到文件？
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How can I redirect console output to file?
提问by vondip
I'm new to c. Is there any simple way to redirect all the console's output (printfs etc.) to a file using some general command line \ linkage parameter (without having to modify any of the original code)?
我是 c 的新手。是否有任何简单的方法可以使用一些通用命令行 \ 链接参数（无需修改任何原始代码）将所有控制台的输出（printfs 等）重定向到文件？
If so what is the procedure?
如果是这样，程序是什么？
回答by Hut8
Use shell output redirection
使用 shell 输出重定向
your-command > outputfile.txt
your-command > outputfile.txt
The standard error will still be output to the console. If you don't want that, use:
标准错误仍然会输出到控制台。如果你不想这样，请使用：
your-command > outputfile.txt 2>&1
your-command > outputfile.txt 2>&1
or
或者
your-command &> outputfile.txt
your-command &> outputfile.txt
You should also look into the teeutility, which can make it redirect to two places at once.
您还应该查看该tee实用程序，它可以使其一次重定向到两个位置。
回答by Reinstate Monica
On unices, you can also do:
在 unices 上，您还可以执行以下操作：
your-command | tee output file.txt
That way you'll see the output and be able to interact with the program, while getting a hardcopy of the standard output (but not standard input, so it's not like a teletype session).
这样，您将看到输出并能够与程序进行交互，同时获得标准输出的硬拷贝（但不是标准输入，因此它不像电传会话）。
回答by Andrés AG
As mentioned above, you can use the > operator to redirect the output of your program to a file as in:
如上所述，您可以使用 > 运算符将程序的输出重定向到文件，如下所示：
./program > out_file
Also, you can append data to an existing file (or create it if it doesnt exit already by using >> operator:
此外，您可以将数据附加到现有文件中（或者使用 >> 运算符创建它，如果它尚未退出：
./program >> out_file
If you really want to learn more about the (awesome) features that the command line has to offer I would really recommend reading this book (and doing lots of programming :))
如果您真的想了解有关命令行必须提供的（很棒的）功能的更多信息，我真的建议您阅读本书（并进行大量编程:)）
Enjoy!
享受！
回答by gpeche
In Unix shells you can usually do executable > file 2> &1, whch means "redirect standard output to fileand error output to standard output"
在 Unix shell 中，您通常可以这样做executable > file 2> &1，这意味着“将标准输出重定向到文件并将错误输出重定向到标准输出”
