有什么方法可以重定向 Windows 命令行中使用“start”运行的命令的 stderr 输出？

Question

I have a program that I want to automate runs for, since it takes awhile to complete. For some reason it outputs everything to stderr instead of stdout, and I'd like to check on its progress, so I find myself needing to redirect stderr output within a start command.

I tried this:

start "My_Program" "C:\Users\Me\my_program.exe" --some --presets --for 
--my_program.exe --output "C:\Users\Me\output_file_for_my_program" 
"C:\Users\Me\input_file_for_my_program" 2>"C:\Users\Me\my_program_output.log"

But it turns out that the redirect is being picked up by start, so that I get a 0-byte file with the result of start - namely, nothing. Is there any way to make the output redirection attach in some way to the output of my_program?

I've experimented with escaping, and neither ^2> nor 2^> seem to work. Any help would be greatly appreciated!

Answer 1

Try this:

start "My_Program" "%SystemRoot%\System32\cmd.exe" /c ""C:\Users\Me\my_program.exe" --some --presets --for --my_program.exe --output "C:\Users\Me\output_file_for_my_program" "C:\Users\Me\input_file_for_my_program" 2>"C:\Users\Me\my_program_output.log""

Obviously, not having "My Program" here I can't test this, per se. If we take that the built-in "FIND.EXE" command returns "File not found - filename" on STDERR, the following is working for me:

start "My_Program" "%SystemRoot%\System32\cmd.exe" /c "find /v /i "blarg" "c:\not a real file.txt" 2> C:\stderr.txt"

Answer 2

Use /B switch. No new window created and redirections remain, but the command is run in background, just as needed.

start /B test.bat >test.txt <nul

test.bat:

@echo off
echo bbb
sleep 10
echo ccc
exit

Answer 3

I used the following command and it worked:

start /affinity 2 /wait cmd.exe /C myprog.exe parameter1 parameter2 1^> .\\a.log 2>> .\\b.log

Ref: http://www.pcreview.co.uk/forums/redirect-standard-output-w-start-command-t1467634.html

Abhishek

Answer 4

如何通过批处理文件中的重定向调用您的命令，并在批处理文件上使用 start？

Answer 5

The following syntax seems to do the trick:

start /wait /b my_program.exe

This runs the program in the background and waits for it to complete. Redirect stdout and stderr as you prefer:

start /wait /b my_program.exe > output.txt 2>&1