That's because >NUL redirects all Standard Output to the NUL device, which does nothing but discard it. 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 There is another stream, Standard Input: many commands accept input at their Standard Input instead of directly from the keyboard. The pipe will still work with the old definition of stdout (which now contains stderr). this content
I need to wait 12 minutes to accept the answer though (serverfault requirement)! –Alec Gorge Apr 16 '10 at 3:22 5 This only redirects stdout. I have used the following to send all output to a file, but again I don't want any file output: command > out.txt 2>&1 I have used command > /dev/null on Much better, isn't it? This will only work in OS/2 and NT, not in MS-DOS. https://support.microsoft.com/en-us/kb/110930
Assume there has not been any redirection prior to issuing the above command. 3>&2 does not save the original definition of 3 because 3 was not previously defined. If you specify a handle, Cmd.exe duplicates the file onto the existing handle.To duplicate a user-defined handle 3 into handle 1, type:>&3To redirect all of the output, including handle 2 (that This can be useful for error messages.
more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed Unfortunately, it can be done only in the old MS-DOS versions that came with a CTTY command. At this point stderr will still be redirected to the previous definition of stdout. Windows Echo To Stderr You also need > nul 2>&1 or 2> nul to kill stderr. –grawity Apr 16 '10 at 14:02 Yes I know that, but thanks for mentioning it for others
How to deal with a coworker that writes software to give him job security instead of solving problems? Windows Stderr But 2>&1 saves the original definition of stderr in 4 (3 has already been used), and 1>&2 saves the original definition of stdout in 5. DIR SomeFile.txt > output.txt 2>&1 To use the contents of a file as the input to a program, instead of typing the input from the keyboard, use the < operator. http://stackoverflow.com/questions/1420965/redirect-stdout-and-stderr-to-a-single-file 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
dir file.xxx > output.msg 2> output.err You can print the errors and standard output to a single file by using the "&1" command to redirect the output for STDERR to STDOUT Pipe Command Output To File Linux And thanks for the con: redirection too! –James K Sep 5 '12 at 4:32 @JamesK - Added another option that may be more robust than using con: –dbenham Sep Disproving Euler proposition by brute force in C Do glass window in space station/space shuttle/other space craft have practical usage? 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:
Sometimes the lines can be padded with spaces to align all redirection signs and make the batch file more readable. Why was Susan treated so unkindly? Windows Command Line Redirect Output To File And Screen 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 Windows Tee Output Here is an example of emulating the Unix command sleep by calling ping against the loopback address.
How about this one, then? >> LOG1.LOG ECHO Directory of all files on C:
>> LOG1.LOG DIR C:\ /S It will do exactly the same, no difference! http://speciii.com/output-to/windows-command-line-redirect-error-output-to-file.html My 21 yr old adult son hates me Is there a "weighting" involved with Sitecore.ContentSearch.SearchTypes.SearchResultItem? Not the answer you're looking for? Display & Redirect Output On this page I'll try to explain how redirection works. Windows Redirect Stderr To Null
Use 1>&2 to send text to Standard Error. This may seem quite a challenge. SomeCommand.exe > temp.txt OtherCommand.exe >> temp.txt By default, the > and >> operators redirect stdout. have a peek at these guys Happy trails...
DIR>filename.txt and DIR>filename.txt are identical, ECHOHelloworld>filename.txt and ECHOHelloworld>filename.txt are not, even though they are both valid. Windows Command Line Pipe Output To Another Command This can be selected by launching CMD /A or CMD /U With the default settings a UCS-2 file can be converted by redirecting it (note it's the redirection not the TYPE/MORE 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
So if that file is there, you did run your command as root user... /bin/null usually doesn't exist -- and /dev/null (which I mentioned) usually is used as the 'black whole' So the interpretation of the parenthesis and redirection is delayed, or deferred. Output from a console (Command Prompt) application or command is often sent to two separate streams. Batch File Redirect Output To File From my Windows help, I searched on redirection (URL ms-its:C:\WINDOWS\Help\ntcmds.chm::/redirection.htm).
The input or output stream location is referred to as a handleThe following table lists operators that you can use to redirect command input and output streams.Redirection operatorDescription>Writes the command output Also known as a pipe. Is there an illusion in the tutorial area? check my blog stdin is handle #0, stdout is handle #1, and stderr is handle #2. –martineau Jul 24 '12 at 5:12 add a comment| Your Answer draft saved draft discarded Sign up
Solutions? How could i do this? Browse other questions tagged windows command-line cmd pipe or ask your own question. For example, to get the command input for the sort command from File.txt: sort We don't support this API version. If Dirlist.txt exists, Cmd.exe replaces the information in the file with the output from the dir command. 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 Use >CON to send text to the screen, no matter what, even if the batch file's output is redirected.
We don't support this API version. If Dirlist.txt exists, Cmd.exe replaces the information in the file with the output from the dir command. 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 Use >CON to send text to the screen, no matter what, even if the batch file's output is redirected.