After 30mins of futile attempt to capture the output of wget, I figured out that the program writes to stderr rather than the stdout. Searching in web and stack-overflow reveals this to be a well known fact.
经过30分钟徒劳的尝试捕获wget的输出后，我发现该程序写入stderr而不是stdout。在Web和堆栈溢出中搜索显示这是一个众所周知的事实。
Any idea why is this so?
知道为什么会这样吗？
1 个解决方案
#1
17
It's well known, because it's in the manual.
众所周知，因为它在手册中。
Reporting messages on stderr is common, because messages are separated from regular output on stdout. This is useful when you combine several tools with a pipe. In this case it would be bad, when regular output and diagnostic messages where mixed up.
在stderr上报告消息很常见，因为消息与stdout上的常规输出分开。将多个工具与管道组合时，这非常有用。在这种情况下，当常规输出和诊断消息混淆时，它会很糟糕。
#1
17
It's well known, because it's in the manual.
众所周知，因为它在手册中。
Reporting messages on stderr is common, because messages are separated from regular output on stdout. This is useful when you combine several tools with a pipe. In this case it would be bad, when regular output and diagnostic messages where mixed up.
在stderr上报告消息很常见，因为消息与stdout上的常规输出分开。将多个工具与管道组合时，这非常有用。在这种情况下，当常规输出和诊断消息混淆时，它会很糟糕。