Note: Be careful when using workarounds like these, they may be broken in future (or even past) Windows versions. This is a fine demonstration of only Standard Output being redirected to the NUL device, but Standard Error still being displayed. share|improve this answer edited Feb 6 '14 at 4:48 falsetru 172k22212264 answered Feb 6 '14 at 4:28 Max Vitesse 11112 add a comment| up vote 9 down vote To add the However, if you were to do this with ECHO command lines, the spaces would really be ECHOed, which is not always convenient, to say the least. weblink
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! A sample of these differences is shown on the DATE/TIME page. (6) Sometimes we need redirection to create a temporary batch file that uses redirection itself. Convince people not to share their password with trusted others Are there any 'smart' ejection seats? 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
How to indicate you are going straight? 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 Output from a console (Command Prompt) application or command is often sent to two separate streams. 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
This is known as “piping” output to another program, and not suprisingly we use the pipe character | to get the job done. Browse other questions tagged windows command-line cmd pipe or ask your own question. The >> operator is a slight variant that appends the output to a target file, rather than overwriting the target file. Batch File Redirect Stderr To File that works.
You can use Cmd.exe to run a program and redirect any of the first 10 handles for the program. To run the netsh routing dump command and then send the command output to Route.cfg, type:netsh routing dump>c:\route.cfgThe > operator opens the specified file with write-only access. asked 4 years ago viewed 1162 times active 4 years ago Related 0How to search for files and directories using a single find command2How do I grep help output in linux?0How Browse other questions tagged windows windows-7 windows-command-prompt stdout or ask your own question.
You can specify a file name or another existing handle.To specify redirection to existing handles, use the ampersand (&) character followed by the handle number that you want to redirect (that Windows Batch File Redirect Stderr To Stdout Force Microsoft Word to NEVER auto-capitalize the name of my company Is the standard Canon 18-55 lens the same as 5 years ago? The “Standard Out” file, known as stdout, is used to write output for display on the screen. Redirection A very common task in batch files is sending the output of a program to a log file.
This file now contains the stdout and stderr output of your command. 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: Redirect Std Error And Stdout To File A CMD error is an error raised by the command processor itself rather than the program/command. Batch File Redirect Error Output 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 get a cumulative logfile, showwing the results from all runs of the process - typically more useful. have a peek at these guys asked 3 years ago viewed 16894 times active 3 years ago Linked -1 Redirect stderr to stdout in a middle of running Related 320How to redirect output to a file and 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 Take this imaginary batch file, for example: ECHO Directory of all files on C: >> LOG1.LOG
DIR C:\ /S >> LOG1.LOG Not exactly easy on the eye, that one? Redirect Std Error To Dev Null
Yes, of course I'm an adult! If Dirlist.txt exists, Cmd.exe replaces the information in the file with the output from the dir command. As a result, you cannot read the file when you use this operator. http://onlinetvsoftware.net/batch-file/batch-file-redirect-error-output.php If you specify a handle, Cmd.exe duplicates the handle you specify onto the existing handle in the system.For example, to open File.txt as input read to handle 0 (that is, STDIN),
There is another stream, Standard Input: many commands accept input at their Standard Input instead of directly from the keyboard. Batch File Redirect Output Append 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). Why did companions have such high social standing?
Why does Windows show "This device can perform faster" notification if I connect it clumsily? Then, after both of them are already joined together, you're redirecting stdout (> with no specifier) to the file. Try this command: ECHO Hello world 2>NUL What you should get is: Hello world You see? Batch File Redirect Output To Console And File Note that if you're using these to make log files, then unless you're sending the outut to _uniquely_named_ (eg date-and-time-stamped) log files, then if you run the same process twice, the
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 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 I do not get any ether when mining So sayeth the Shepherd Which requires more energy: walking 1 km or cycling 1 km at the same speed? this content Contact Failed Mail Donate Batch How To ...
A safer way to redirect STARTed commands' output would be to create and run a "wrapper" batch file that handles the redirection. File names that contain the string "LOG" are stored as a list of file names (for example, NetshConfig.log, Logdat.svd, and Mylog.bat) in the Loglist.txt file. I'm imagining something like set STDOUT=stdout.log echo Some text a.exe b.exe c.exe Where both Some text, and the output of a.exe, b.exe and c.exe would go to stdout.log Is this possible? Redirection from a device is not always possible. (2) Redirection to the NUL device is often used to hide standard output, instead of displaying it on screen: COPY *.* A:
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