bash 如何开球到标准错误？
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How to tee to stderr?
提问by djechlin
I want to split stdoutso that it is printed both to stdoutand stderr. This sounds like a job for teebut the syntax is evading me -
我想拆分stdout以便它同时打印到stdout和stderr。这听起来像是一份工作，tee但语法让我望而却步-
./script.sh | tee stderr
Of course, how should stderractually be referred to here?
当然，stderr这里究竟应该怎么称呼呢？
回答by brianegge
The only cross platform method I found which works in both interactive and non-interactive shells is:
我发现的唯一在交互式和非交互式 shell 中都有效的跨平台方法是：
command | tee >(cat 1>&2)
The argument to tee is a file or file handle. Using process substitutionwe send the output to a process. In the process =cat=, we redirect stdout to stderr. The shell (bash/ksh) is responsible for setting up the 1 and 2 file descriptors.
tee 的参数是文件或文件句柄。使用进程替换，我们将输出发送到进程。在进程=cat= 中，我们将stdout 重定向到stderr。shell (bash/ksh) 负责设置 1 和 2 文件描述符。
回答by Nicholas Wilson
./script.sh | tee /dev/fd/2
Note that this is dependant on OS support, not any built-in power in tee, so isn't universal (but will work on MacOS, Linux, Solaris, FreeBSD, probably others).
请注意，这取决于操作系统支持，而不是 tee 中的任何内置功能，因此不是通用的（但可以在 MacOS、Linux、Solaris、FreeBSD 上运行，可能还有其他）。
回答by David W.
./script.sh 2>&1 >/dev/null | tee stderr.out
That opens STDERR to STDOUT, and then disposes of STDOUT.
这将打开 STDERR 到 STDOUT，然后处理 STDOUT。
