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But the next one is new: test.bat > NUL 2>&1 and you should see: C:\>test.bat This text goes to the Console C:\>_ This time we redirected both Standard Output and Standard What 2>&1 does, is merge Standard Error into the Standard Output stream, so Standard output and Standard Error will continue as a single stream. DIR>filename.txt and DIR>filename.txt are identical, ECHOHelloworld>filename.txt and ECHOHelloworld>filename.txt are not, even though they are both valid. The ECHO command sends all its output to Standard Output. have a peek here

Why can't the second fundamental theorem of calculus be proved in just two lines? By definition Console isn't a stream. For an overview of redirection and piping, view my original redirection page. Linked 0 Error handling in batch script 14 Foolproof way to check for nonzero (error) return code in windows batch file 0 capturing error message from echo in cmd prompt 1 http://stackoverflow.com/questions/1164049/batch-files-error-handling

Error Handling In Batch Script

Computer Hope Forum Main pageFree helpTipsDictionaryForumLinksContact Welcome, Guest. The first program/script must conform to the convention of returning 0 on success and non-0 on failure for this to work. yourCommand && ( echo yourCommand was successful ) || ( echo yourCommand failed ) There is one complication you should be aware of. Before posting on our computer help forum, you must register.

ECHO I suppose that's why CTTY is no longer available on Windows systems. Mencken Panthers_DenTopic StarterRookie Re: How to capture batch file error msg's? « Reply #8 on: May 12, 2010, 01:15:54 PM » Quote from: Sidewinder on May 12, 2010, 10:30:41 AMFor the A common technique is to use > to create/overwrite a log file, then use >> subsequently to append to the log file. Batch File Echo Error Message Browse other questions tagged batch-file or ask your own question.

That's because we redirected the Standard Error stream to the NUL device, but the ECHO command sent its output to the Standard Output stream, which was not redirected. Disconnect all previous connections to the
server or shared resource and try again..Here is what I get in the Logfile:Code: [Select]------------------------------------------------
-- Batch Ran on Tue 05/11/2010 at 8:57:05.97 --
------------------------------------------------
http://www.robvanderwoude.com/errormessages.php You can redirect stderr by using the file number 2 in front of the operator: DIR SomeFile.txt 2>> error.txt You can even combine the stdout and stderr streams using the file

Equal pay for equal work is controversial? Cmd Error Message This is rare for scripts intended for interactive use, but, it can be super helpful when writing scripts you support but you don’t have access to the target systems. @ECHO OFF I didn't think about trying 2>> (actually didn't even know what 2> did until now), so I just did that one and it worked, even with >> :-)Code: [Select]net use Z: In Windows (and OS/2) there is a simple solution: NET HELPMSG (or NET HELP in OS/2).

Batch File Errorlevel

Finally, the “Standard Err” file, known as stderr, contains any error messages for display on the screen. have a peek here This can be useful for error messages. Error Handling In Batch Script To execute a follow-on command after sucess, we use the && operator: SomeCommand.exe && ECHO SomeCommand.exe succeeded! Batch File Error Message Remember, this is duct tape programming.

It is not ok to use spaces in >> or 2> or 2>&1 or 1>&2 (before or after is ok). navigate here SMF 2.0.11 | SMF © 2015, Simple Machines Page created in 0.16 seconds with 24 queries. {{offlineMessage}} Store Store home Devices Microsoft Surface PCs & tablets Xbox Virtual reality Accessories Windows Not the answer you're looking for? The batch file would look like this: command > logfile and the command line would be: START batchfile Some "best practices" when using redirection in batch files: Use >filename.txt 2>&1 to Batch File Get Error Message

SET /A ERROR_HELP_SCREEN=1 SET /A ERROR_FILE_NOT_FOUND=2 SET /A ERROR_FILE_READ_ONLY=4 SET /A ERROR_UNKNOWN=8 This gives me the flexibility to bitwise OR multiple error numbers together if I want to record numerous problems In Windows XP the result is no text on screen and file.txt containing the line Helloworld2, including the trailing "2" (CMD.EXE interprets it as ECHOHelloworld2>file.txt). PING 127.0.0.1 > NUL Redirecting Program Output As Input to Another Program Let’s say you want to chain together the output of one program as input to another. http://introbuilder.net/error-message/windows-get-last-error-message.php When you are done typing, hit CTRL+Z, which sends the end-of-file (EOF) character.

You may also want to check for specific error codes. If Errorlevel Neq 0 Display text To display a text on screen we have the ECHO command: ECHO Hello world This will show the following text on screen: Hello world When I say "on screen", Defining an inline equation environment Why didn’t Japan attack the West Coast of the United States during World War II?

That's because >NUL redirects all Standard Output to the NUL device, which does nothing but discard it.

Those of you familiar with one of the Unix/Linux shells probably know what these streams are: Standard Output Standard Error Console Standard Output is the stream where all, well, standard output Logged gplApprentice Thanked: 27 Re: How to capture batch file error msg's? « Reply #1 on: May 11, 2010, 09:15:09 AM » yes, it is more than possible, it is easy!the Standard Error is the stream where many (but not all) commands send their error messages. Dos Errorlevel Use 1>&2 to send text to Standard Error.

ECHO The only way to get control over the computer again is a cold reboot, ECHO or the following command: CTTY CON A pause or prompt for input before the CTTYCON The general idea was this: CTTY NUL ECHO Echo whatever you want, it won't be displayed on screen no matter what. SomeCommand.exe > temp.txt OtherCommand.exe >> temp.txt By default, the > and >> operators redirect stdout. this contact form SomeFile.exe IF %ERRORLEVEL% EQU 9009 ( ECHO error - SomeFile.exe not found in your PATH ) It’s hard to know this stuff upfront – I generally just use trial and error

The “Standard Out” file, known as stdout, is used to write output for display on the screen. Note: Be careful when using workarounds like these, they may be broken in future (or even past) Windows versions. The “Standard In” file, known as stdin, contains the input to the program/script. TYPE CON > output.txt There are a number of other special files on DOS that you can redirect, however, most are a bit dated like like LPT1 for parallel portt printers

I've been Googling a bit for a general error handling approach and can't find anything really useful. Probably the most familiar example is MORE: DIR /S | MORE where the MORE command accepts DIR's Standard Output at its own Standard Input, chops the stream in blocks of 25 You'd want to look at a more powerful scripting language.