如何使用 Bash 重定向标准输入和输出
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How to redirect standard input and output with Bash
提问by Inuart
#!/bin/bash
./program < input.txt > output.txt
The > output.txtpart is being ignored so output.txt ends up being empty.
该> output.txt部分被忽略，因此 output.txt 最终为空。
This works for the sortcommand so I expected to also work for other programs.
这适用于sort命令，所以我希望也适用于其他程序。
Any reason this doesn't work? How should I achieve this?
任何原因这不起作用？我应该如何实现这一目标？
回答by Oliver Charlesworth
The most likely explanation is that the output you're seeing is from stderr, not stdout. To redirect both of them to a file, do this:
最可能的解释是您看到的输出来自stderr，而不是stdout。要将它们都重定向到一个文件，请执行以下操作：
./program < input.txt > output.txt 2>&1
or
或者
./program < input.txt &> output.txt
