Windows Batch File Redirect Error Output
Word/phrase/idiom for person who is no longer deceived In the future, around year 2500, will only one language exist on earth? 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. In the future, around year 2500, will only one language exist on earth? I can assure you I did try! http://pubdimensions.com/batch-file/windows-batch-error-output-redirect.php
The “Standard Out” file, known as stdout, is used to write output for display on the screen. The >> operator is a slight variant that appends the output to a target file, rather than overwriting the target file. That still does not explain it imho. –MarioDS Nov 3 '15 at 12:04 @MDeSchaepmeester, if you do dir 2>&1 > a.txt, you're first redirecting (>) stream 2 (stderr) to 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).
Windows Command Line Redirect Output To File And Screen
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 Hi, I'm Steve. Happy trails...
Are they identical? In this case, "2>&1", which is seen and precessed first, causes the output for "stream 2" ("error output") to be redirected to the place where "stream 1" is currently directed to, This is because when the OS is determining the file to redirect to, it will stop looking for the filename when it encounters an unquoted space: "c:/Program". Windows Tee 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
ECHO I suppose that's why CTTY is no longer available on Windows systems. Windows Redirect Stderr To Stdout 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 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. http://www.robvanderwoude.com/battech_redirection.php ECHO Tee.bat, Version 2.11a for Windows NT 4 / 2000 / XP ECHO Display text on screen and redirect it to a file simultaneously ECHO.
windows batch-file cmd batch-processing share|improve this question asked Dec 10 '13 at 1:09 user3085030 181123 add a comment| 7 Answers 7 active oldest votes up vote 55 down vote The simple Batch File Logging Now, lastly, using both redirections (">file" AND "2>&1"): C:\Temp\emptyfolder>dir nonexistantfile>output.txt 2>&1 C:\Temp\emptyfolder>type output.txt Volume in drive C is CCCCCCCC Volume Serial Number is 1234-ABCD Directory of C:\Temp\emptyfolder File Not Found C:\Temp\emptyfolder> 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 my matrix doesnt fit the page Probability of throwing a die Am I interrupting my husband's parenting?
Windows Redirect Stderr To Stdout
Positional Bathroom Etiquette Why does Wolfram Alpha say the roots of a cubic involve square roots of negative numbers, when all three roots are real? It is also worth noting that the order is important. Windows Command Line Redirect Output To File And Screen This selects the second output stream which is STDERR. Batch File Redirect Output To File IF NOT "%OS%"=="Windows_NT" ECHO Usage: some_command ³ TEE.BAT [ -a ] filename IF NOT "%OS%"=="Windows_NT" GOTO Skip ECHO Usage: some_command ^| TEE.BAT [ -a ] filename :Skip ECHO.
In the future, around year 2500, will only one language exist on earth? http://pubdimensions.com/batch-file/windows-batch-file-error-output.php Never mind, I'm just nitpicking... –Eitan T Nov 15 '12 at 14:21 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Securing a LAN that has multiple exposed external at Cat 6 cable runs? When specifying a filename (or path) that contains spaces, you must surround it in double-quote marks ("...") . Windows Stderr
When I added a resistor to a set of christmas lights where I cut off bulbs, it gets hot. 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? Now make a typo again: EHCO Hello world 2>NUL What did you get? http://pubdimensions.com/batch-file/windows-batch-file-redirect-error.php 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
Why is 10W resistor getting hot with only 6.5W running through it? "/usr/bin/ping" is shown as yellow-on-red in the default Fedora bash color scheme -- what does it mean? Windows Redirect Stderr To Null There is another stream, Standard Input: many commands accept input at their Standard Input instead of directly from the keyboard. share|improve this answer answered Dec 10 '13 at 1:15 Carey Gregory 5,80021737 add a comment| up vote 1 down vote I know this is an older post, but someone will stumble
The actual result will depend on the operating system and version, and may also depend on the command being executed.
The general idea was this: CTTY NUL ECHO Echo whatever you want, it won't be displayed on screen no matter what. First: ... 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 Batch File Output To Text File Append This only shows up when I try to send it to a file.
REM *** WARNING: THIS WILL NOT REDIRECT STDERR TO STDOUT **** dir 2>&1 > a.txt share|improve this answer edited Oct 9 '15 at 19:40 Peter Mortensen 10.3k1369107 answered May 23 '13 How do I disable or lock lookup fields on a Visual Force page? windows scripting batch-file cmd stderr share|improve this question edited Oct 9 '15 at 19:42 Peter Mortensen 10.3k1369107 asked Jan 27 '09 at 8:46 mik 5032914 add a comment| 2 Answers 2 check over here The result will be an empty logfile.
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 I strongly suspect this has got to do with the way "cmd" parses commands that gives two different meanings depending on the order in which you specify the redirection. Not the answer you're looking for? If you examine your file "c:\test.txt", you will most likely see that the "crash complaint" was written to the file. 2>&1 shouldn't cause or prevent the program from crashing, it just
Typically, programs write their "Error" output (error and warning messages) to stream 2. Obviously the output is there, the question is if there is some way to catch it. SomeCommand.exe > temp.txt OtherCommand.exe >> temp.txt By default, the > and >> operators redirect stdout.