By definition Console isn't a stream. Use >CON to send text to the screen, no matter what, even if the batch file's output is redirected. In most cases the Exit Code is the same as the ErrorLevel Numeric handles: STDIN = 0 Keyboard input STDOUT = 1 Text output STDERR = 2 Error text output UNDEFINED For an overview of redirection and piping, view my original redirection page. have a peek at this web-site
The same result you got with ECHOHelloworld without the redirection. There are tricks to decrease the number of file handles lost by redirection: redirect to (one single temporary) file instead of NUL specify a directory if you have to redirect to net stop w3svc >NUL 2>&1.. asked 3 years ago viewed 17167 times active 3 years ago Blog Stack Overflow Podcast #93 - A Very Spolsky Halloween Special Visit Chat Linked -1 Redirect stderr to stdout in http://www.robvanderwoude.com/battech_redirection.php
Copy the following code into Notepad and save it as "test.bat": @ECHO OFF ECHO This text goes to Standard Output ECHO This text goes to Standard Error 1>&2 ECHO This text share|improve this answer edited Jul 22 at 10:38 Tshepang 346212 answered Jul 29 '15 at 16:37 AirCombat 515319 1 Command Prompt is cmd.exe. '> null' creates a file called 'null' Where you put 2>&1 is rather critical. Finally, the “Standard Err” file, known as stderr, contains any error messages for display on the screen.
The maximum number of consecutive pipes is 2042 Examples: DIR >MyFileListing.txt DIR /o:n >"Another list of Files.txt" DIR C:\ >List_of_C.txt 2>errorlog.txt DIR C:\ >List_of_C.txt & DIR D:\ >List_of_D.txt ECHO y| DEL Sometimes the lines can be padded with spaces to align all redirection signs and make the batch file more readable. On Marc Stern's web site I found a great solution: just place the redirections before the actual commands. Windows Redirect Stderr To Null Miscellaneous Tweaks Web Stuff Conversions My Photo Galleries About This Site Disclaimer News FAQ Search What's New Objective Site Policy Your Preferences Credits The Making Of...
thanks! –wasatchwizard Apr 4 '13 at 17:55 1 @wasatchwizard Ithink I had trouble with that, but >NUL 2>NUL worked fine –FrinkTheBrave Aug 4 '14 at 8:24 4 If there The command interpreter first creates the empty destination file, then runs the DIR command and finally saves the redirected text into the file. And some, not many, commands send their output to the screen bypassing Standard Output and Standard Error, they use the Console. When you redirect console output using the ">" symbol, you are only redirecting STDOUT.
Solutions? Windows Echo To Stderr Contact Failed Mail Donate Batch How To ... Redirect errors to a separate error log file: Run: test.bat > testlog.txt 2> testerrors.txt and you'll get this text on screen (we'll never get rid of this line on screen, as Duly edited my answer. –AirCombat Jul 29 '15 at 18:54 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up
It will only do what it is supposed to do when placed at the end of the command line (as Jennie Walker pointed out to me) or right before the next http://www.robvanderwoude.com/battech_redirection.php Therefore 2> 2.txt works (or 2> &1) 2 > 2.txt does not; 2 > &1 does not. –The Red Pea Apr 3 '15 at 21:41 Reference document from Microsoft: Windows Command Line Redirect Output To File And Screen I can assure you I did try! Windows Stderr Happy trails...
But now, try these: VER|TIME>LOG1.LOG
>LOG1.LOGVER|TIME As you will notice, in the second line, it is the output of VER that gets redirected to LOG1.LOG!! Check This Out Next, run: test.bat 2> NUL and you should see: C:\>test.bat This text goes to Standard Output This text goes to the Console C:\>_ We redirected Standard Error to the NUL device, In this case, we could also have used test.bat>NUL2>NUL This redirects Standard Output to the NUL device and Standard Error to the same NUL device. How to use sort on an awk print command? =TEXT([Date Column],"MMMM") issue What commercial flight route has the biggest number of (minimum possible) stops/layovers from A to B? Windows Tee Output
There is another stream, Standard Input: many commands accept input at their Standard Input instead of directly from the keyboard. Disproving Euler proposition by brute force in C Should the sole user of a *nix system have two accounts? To illustrate my story there are some examples you can try for yourself. Source Note however, that a space between an ECHO command and a > will be redirected too.
Why is the size of my email about a third bigger than the size of its attached files? Batch File Output To Text File Append Run: test.bat > NUL and you should see: C:\>test.bat This text goes to Standard Error This text goes to the Console C:\>_ We redirected Standard Output to the NUL device, and Make sure you place the redirection "commands" in this order.
The “Standard In” file, known as stdin, contains the input to the program/script. Redirect "all" output to a single file: Run: test.bat > test.txt 2>&1 and you'll get this text on screen (we'll never get rid of this line on screen, as it is Redirecting Standard Error in "true" MS-DOS (COMMAND.COM) isn't possible (actually it is, by using the CTTY command, but that would redirect all output including Console, and input, including keyboard). Error Prompt Means It takes time to intialize the redirection.
Redirect errors to a separate error log file: Run: test.bat > testlog.txt 2> testerrors.txt and you'll get this text on screen (we'll never get rid of this line on screen, as So you need to set up stream 1 first –FrinkTheBrave Aug 4 '14 at 8:31 1 @FrinkTheBrave but stream 1 is standard output (e.g. And, no, I'm not Steve Jansen the British jazz drummer, though that does sound like a sweet career. have a peek here Redirection A very common task in batch files is sending the output of a program to a log file.
windows windows-7 windows-command-prompt stdout share|improve this question edited Aug 18 '10 at 3:12 asked Apr 16 '10 at 3:19 Alec Gorge 182118 I hope you used command > /dev/null Redirect to NUL (hide errors) command 2> nul Redirect error messages to NUL command >nul 2>&1 Redirect error and output to NUL command >filename 2> nul Redirect output to file but How, for example, are you going to append the following command line to a temporary batch file: DIR | FINDSTR /R /I /C:" 0 Dir(s)" >NUL The following code will definitely Use >logfile.txt2>errorlog.txt to redirect success and error messages to separate log files.
By definition Console isn't a stream. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the