Dos Error Output
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Dos Batch Redirect Error Output
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Dos Error 53
them; it only takes a minute: Sign up Redirect stdout and stderr to a single file up vote 358 down vote favorite 97 I'm trying to redirect all output (stdout + stderr) of a DOS command to a single https://support.microsoft.com/en-us/kb/110930 file: C:\>dir 1> a.txt 2> a.txt The process cannot access the file because it is being used by another process. Is it possible, or should I just redirect to two separate files? windows command-line cmd pipe share|improve this question edited Oct 9 '15 at 19:39 Peter Mortensen 10.2k1369107 asked Sep 14 '09 at 11:20 ripper234 66.4k165464747 2 TechNet: Using command redirection operators (answers this better than any of the answers here). –Martin Prikryl May 11 at 6:09 add http://stackoverflow.com/questions/1420965/redirect-stdout-and-stderr-to-a-single-file a comment| 6 Answers 6 active oldest votes up vote 553 down vote accepted You want: dir > a.txt 2>&1 share|improve this answer answered Sep 14 '09 at 11:23 Anders Lindahl 24.7k55275 10 thanks for this, didn't know that this unix shell syntax works for DOS too! –chaindriver Aug 14 '12 at 17:00 11 this is great for hiding all output.. net stop w3svc >NUL 2>&1.. 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 is a Handle, there cannot be a space between the Handle (i.e. 2) and the redirect operator (i.e. >). 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: support.microsoft.com/en-us/kb/110930 –Jonathan Benn Feb 3 at 18:58 | show 1 more comment up vote 101 down vote Anders Lindahl's answer is correct, but it should be noted that if you are redirecting stdout to a file and want to redirect stderr as well then you MUST ensure that 2>&1 is specified AFTER the 1> redirect, otherwise it will not work. 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 Mortens
4 – stdin, stdout, stderr Part 5 – If/Then Conditionals Part 6 – Loops Part 7 – Functions Part 8 – Parsing Input Part 9 – Logging Part 10 – Advanced http://steve-jansen.github.io/guides/windows-batch-scripting/part-4-stdin-stdout-stderr.html Tricks DOS, like Unix/Linux, uses the three universal “files” for keyboard input, printing text http://perlmaven.com/stdout-stderr-and-redirection on the screen, and the printing errors on the screen. The “Standard In” file, known as stdin, contains the input to the program/script. The “Standard Out” file, known as stdout, is used to write output for display on the screen. Finally, the “Standard Err” file, known as stderr, contains any error messages for display on dos error the screen. File Numbers Each of these three standard files, otherwise known as the standard streams, are referernced using the numbers 0, 1, and 2. Stdin is file 0, stdout is file 1, and stderr is file 2. Redirection A very common task in batch files is sending the output of a program to a log file. The > operator sends, or redirects, stdout or stderr to another file. For redirect error output example, you can write a listing of the current directory to a text file: DIR > temp.txt The > operator will overwrite the contents of temp.txt with stdout from the DIR command. The >> operator is a slight variant that appends the output to a target file, rather than overwriting the target file. A common technique is to use > to create/overwrite a log file, then use >> subsequently to append to the log file. SomeCommand.exe > temp.txt OtherCommand.exe >> temp.txt By default, the > and >> operators redirect stdout. You can redirect stderr by using the file number 2 in front of the operator: DIR SomeFile.txt 2>> error.txt You can even combine the stdout and stderr streams using the file number and the & prefix: DIR SomeFile.txt 2>&1 This is useful if you want to write both stdout and stderr to a single log file. 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. SORT < SomeFile.txt Suppressing Program Output The pseudofile NUL is used to discard any output from a program. Here is an example of emulating the Unix command sleep by calling ping ag
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