Obviously the output is there, the question is if there is some way to catch it. Streams The output we see in this window may all look alike, but it can actually be the result of 3 different "streams" of text, 3 "processes" that each send their share|improve this answer answered Sep 16 at 18:20 Anthony 565 add a comment| up vote 0 down vote There is a cool little program you can use to redirect the output Not the answer you're looking for? have a peek at this web-site
Whether a program writes a particular output to STDOUT or STDERR is determined by the programmer and how they wrote the program. asked 3 years ago viewed 26165 times active 5 months ago Blog Stack Overflow Podcast #93 - A Very Spolsky Halloween Special Linked 1 Redirecting Shutdown.exe errors to file Related 9Windows Join them; it only takes a minute: Sign up Redirect stdout and stderr to a single file up vote 368 down vote favorite 101 I'm trying to redirect all output (stdout In Windows NT4, early Windows 2000 versions, and OS/2 there used to be some ambiguity with ECHOed lines ending with a 1 or 2, immediately followed by a >: ECHO Hello
In Windows NT4 and later (CMD.EXE) and in OS/2 (also CMD.EXE) Standard Error can be redirected by using 2> instead of > A short demonstration. To illustrate my story there are some examples you can try for yourself. Typically, programs write their "Normal" output to stream 1. Note: Be careful when using workarounds like these, they may be broken in future (or even past) Windows versions.
For example: command1 > log.txt command2 >> log.txt command3 >> log.txt etc When the batch file completes, log.txt will contain all the output in chronological order. When a program writes to the terminal, it can write to one of two Streams. Unfortunately, it can be done only in the old MS-DOS versions that came with a CTTY command. Windows Tee This selects the second output stream which is STDERR.
This is known as “piping” output to another program, and not suprisingly we use the pipe character | to get the job done. Ok, now that we get the idea of this concept of "streams", let's play with it. 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. http://www.robvanderwoude.com/battech_redirection.php Join them; it only takes a minute: Sign up Redirect stdout and stderr from inside a batch file up vote 10 down vote favorite 2 Is there a way to redirect
C++11 - typeid uniqueness Why does Wolfram Alpha say the roots of a cubic involve square roots of negative numbers, when all three roots are real? Batch File Logging Use >CON to send text to the screen, no matter what, even if the batch file's output is redirected. It takes time to intialize the redirection. When I do include it, it does not.
A workaround that may look a bit intimidating is grouping the command line and escaping the redirection: START CMD.EXE /C ^(command ^> logfile^) What this does is turn the part between share|improve this answer answered Jan 27 '09 at 12:49 aphoria 12.5k34056 7 If you want them redirected to separate files, you can do mycommand >stdout.txt 2>stderr.txt –Kip Oct 24 '12 Windows Command Line Redirect Output To File And Screen Note however, that a space between an ECHO command and a > will be redirected too. Batch File Redirect Output To File Second: 'c:/Program' ...
If the file "filename.ext" already exists, it will be deleted first. http://speciii.com/batch-file/windows-batch-file-error-output.html This typically happens when you try to redirect to a file using a | instead of a >. I assembled all the commands in a batch file, and it runs, but I would like the batch file, when run to output the results to a text file (log), is What makes an actor an A-lister Composition of Derangements temporary file not found in sh script What's this I hear about First Edition Unix being restored? Windows Stderr
Nothing That's because the error message was sent to the Standard Error stream, which was in turn redirected to the NUL device by 2>NUL When we use > to redirect Standard 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. You need to redirect the output from each of the commands within the batch to your log file using the append operator >> instead of >. Source Browse other questions tagged windows command-line or ask your own question.
It is not ok to use spaces in >> or 2> or 2>&1 or 1>&2 (before or after is ok). Windows Redirect Stderr To Null Should the sole user of a *nix system have two accounts? The 1 in 1> refers to Stream 1.
share|improve this answer answered Dec 10 '13 at 1:15 Magoo 39k32650 add a comment| up vote 2 down vote @echo off >output.txt ( echo Checking your system infor, Please wating... The “Standard Out” file, known as stdout, is used to write output for display on the screen. my matrix doesnt fit the page Probability of throwing a die Am I interrupting my husband's parenting? Batch File Output To Text File Append Why does a shorter string of lights not need a resistor?
The same result you got with ECHOHelloworld without the redirection. Output a googol copies of a string Word/phrase/idiom for person who is no longer deceived Why did my cron job run? Output is generated in both cases though. –pzkpfw May 5 '13 at 9:35 | show 5 more comments Your Answer draft saved draft discarded Sign up or log in Sign have a peek here EXAMPLE The command "dir file.xxx" (where file.xxx does not exist) will display the following output: Volume in drive F is Candy Cane Volume Serial Number is 34EC-0876 File Not Found If
What is an instant of time? windows command-line cmd pipe share|improve this question edited Oct 9 '15 at 19:39 Peter Mortensen 10.3k1369107 asked Sep 14 '09 at 11:20 ripper234 67.3k172467750 3 TechNet: Using command redirection operators 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 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.
The >> operator is a slight variant that appends the output to a target file, rather than overwriting the target file. 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). Note: Be careful when using workarounds like these, they may be broken in future (or even past) Windows versions. Note however, that a space between an ECHO command and a > will be redirected too.
Identify a short story about post-apocalyptic household robots Blender renders the bricks wrong Is there an illusion in the tutorial area? 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 The exe is working fine in other words. Then, after both of them are already joined together, you're redirecting stdout (> with no specifier) to the file.
Unfortunately, it can be done only in the old MS-DOS versions that came with a CTTY command. If you want to APPEND the output, use >> instead of >. > will start a new logfile. A weird and spooky clock Given that ice is less dense than water, why doesn't it sit completely atop water (rather than slightly submerged)?