批处理执行的日志输出问题

Question

I have a file batchfile.bat that has some 7zip and Mysql operations. I have a second batch file to execute this called executor.bat . The executor.bat file only has the below code

.\batchfile.bat >>output.txt

So i expect all execution output to be written into output.txt . However, when i double click on executor.bat , i see the command prompt open and some mysql error messages, are coming on this command prompt instead of moving into the output.txt file. On the other hand, i can see 7-zip command line output getting captured in the output.txt file.

How can i further redirect the messages on command prompt to go into the output.txt file

Answer 1

The >> redirector appends a STDOUT (text output) to the target file, but mysql error messages are sent to STDERR (error text output). To redirect both output and errors to one file, use next syntax:

.\batchfile.bat >>output.txt 2>>&1

FYI, all numeric handles are:

STDIN     = 0  Keyboard input
STDOUT    = 1  Text output
STDERR    = 2  Error text output
UNDEFINED = 3-9

Answer 2

Error messages get sent to the command prompt through a different output pipe than regular messages.

Try updating executor.bat to .\\batchfile.bat >>output.txt 2>>output.txt