Command Line Standard Error Redirect
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Command Line Redirect My Documents
Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs command line redirect all output to file Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, command prompt redirect stderr just like you, helping each other. Join them; it only takes a minute: Sign up Redirect stdout and stderr to a single file up vote 357 down vote favorite 97 I'm trying to redirect all output (stdout https://support.microsoft.com/en-us/kb/110930 + stderr) of a DOS command to a single 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 66.3k165464747 2 TechNet: Using command redirection operators (answers this http://stackoverflow.com/questions/1420965/redirect-stdout-and-stderr-to-a-single-file better than any of the answers here). –Martin Prikryl May 11 at 6:09 add 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 Did you find this question interesting? Try our newsletter Sign up for our newsletter and get our top new questions delivered to your inbox (see an example). Subscribed! Success! Please click the link in the confirmation email to activate your subscription. up vote 101 down v
is connected to the terminal keyboard and standard output and error to the terminal screen. The way of indicating an end-of-file on the default standard input, a http://sc.tamu.edu/help/general/unix/redirection.html terminal, is usually
commandB commandA & commandB Run commandA and then run commandB commandA && commandB Run commandA, if it succeeds then run commandB commandA || commandB Run commandA, if it fails then run commandB commandA && commandB || commandC If commandA succeeds run commandB, if it fails commandC Success and failure are based on the Exit Code of the command. In most cases the Exit Code is the same as the ErrorLevel Numeric handles: STDIN = 0 Keyboard input STDOUT = 1 Text output STDERR = 2 Error text output UNDEFINED = 3-9 command 2> filename Redirect any error message into a file command 2>> filename Append any error message into a file (command)2> filename Redirect any CMD.exe error into a file command > file 2>&1 Redirect errors and output to one file command > fileA 2> fileB Redirect output and errors to separate files command 2>&1 >filename This will fail! 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 suppress error (command)>filename 2> nul Redirect output to file but suppress CMD.exe errors Any long filenames must be surrounded in "double quotes". A CMD error is an error raised by the command processor itself rather than the program/command. Redirection with > or 2> will overwrite any existing file. You can also redirect to a printer with > PRN or >LPT1 Multiple commands on one line In a batch file the default behaviour is to read and expand variables one line at a time, if you use & to run multiple commands on a single line, then any variable changes will not be visible until execution moves to the next line. For example: SET /P _cost="Enter the price: " & ECHO %_cost% This behaviour can be changed using SETLOCAL EnableDelayedExpansion Creating a new file Create empty files using the NUL device: Type NUL >EmptyFile.txt or Copy NUL EmptyFile.txt To prevent the > and < characters from causing redirection, escape with a caret: ^> or ^< Redirect multiple lines by bracketing a set of commands: ( Echo sample text1 Echo sample text2 ) > c:\logfile.txt Exit Codes If the filename or command is not found then redirection will set an Exit Code of 1 Unicode The CMD Shell can redirect ASCII/ANSI (the default) or Unicode (UCS-2 le) but not UTF-8. 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 command that makes the encoding change) TYPE unicode.txt > asciifile.txt European characters like ABCàéÿ will usually conve