在Windows命令提示符（cmd.exe）中管道输出失败的命令

Question

I'm trying to redirect stderr to stdout and then use tee to both show it on sceen and dump to a file.

When running a command with a typo (to which cmd reacts with 'CommandNameWithATypo' is not recognized as an internal or external command, operable program or batch file. ) I expect this error message to be shown on screen and also written to the file specified in the tee command. However, running this:

CommandNameWithATypo 2>&1 | tee test.txt

I get no output on screen nor to a file (no file is created), as if piping never happened. Is this intended to be like this? May there be a workaround?

Answer 1

the problem is, that "cmd knows best where to put redirection" /for prove, write a batch file with >nul echo hello (don't turn echo off ), run it and watch the output. You can force it to bind redirection to the intended part of the code with a code block:

( CommandNameWithATypo 2>&1 ) | tee test.txt 

(sorry for "you do have tee installed, don't you?", but without tee , you get exactly what you described: nothing. Try wrongCommand 2>&1 | notTee file.txt )