How can I get the stderr of command in powershell -c sent to stderr?

Question

_{Wednesday, December 13, 2017 6:22 AM | 1 vote}

I have to run a powershell command from a batch file. stdout of the command is redirected to a file. I have noticed when the command fails that the error output is sent to stdout. For example consider this:

powershell -c "doesnotexist"  1>foo

I would expect that when I execute that command that the error would be shown because stderr is not redirected, however the error is actually sent to stdout. Is there a way I can make it so the command I execute via -c has its stderr sent to stderr of powershell.exe?

All replies (1)

_{Saturday, December 23, 2017 2:47 AM ✅Answered}

Thanks but I'm trying to do it as a one-liner from the command prompt. I found this answer on stackoverflow that says if stderr is redirected to a file then powershell will send the output to stderr, so for now I'm going to do that. In other words

REM Error output is sent to stdout (foo):
powershell -c "doesnotexist"  1>foo

REM Error output is sent to stderr (bar):
powershell -c "doesnotexist"  1>foo 2>bar

It's confusing but I noted it in a comment for anyone else that has to work on the script. Otherwise I think you're right, I'd have to do it in a powershell script. It may also be possible to capture the error in a one-liner and then send it to stderr via [Console]::Error.WriteLine() but that seems less straightforward than what I have above.