Dos Standard Error Output
Contents |
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads dos redirect standard error with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack
Standard Error Regression Output
Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign
Standard Error Output Linux
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 file: C:\>dir 1> a.txt 2> a.txt The process cannot access
Redirect Standard Error And Output To Different Files
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 a comment| 6 Answers 6 active oldest votes up vote 553 down vote accepted redirect standard error and output to /dev/null 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 Mortensen 10.2k1369107 answered May 23 '13 at 11:59 DelboyJay 1,1791511 2 AFTER is what cost me hours to figure out what's wrong DelboyJay! Thank you! –Nam G V
How to get Help for Perl? Perl on the command line Core Perl documentation and CPAN module documentation POD - Plain Old Documentation Debugging Perl scripts Scalars Common Warnings and Error messages in Perl Automatic string to number conversion or casting in Perl Conditional redirect standard error and output to file windows statements, using if, else, elsif in Perl Boolean values in Perl Numerical operators String operators: concatenation python standard error output (.), repetition (x) undef, the initial value and the defined function of Perl Strings in Perl: quoted, interpolated and escaped Here documents, or how c++ standard error output to create multi-line strings in Perl Scalar variables Comparing scalars in Perl String functions: length, lc, uc, index, substr Number Guessing game while loop Scope of variables in Perl Short-circuit in boolean expressions Files How to exit from a http://stackoverflow.com/questions/1420965/redirect-stdout-and-stderr-to-a-single-file Perl script? Standard output, standard error and command line redirection Warning when something goes wrong What does die do? Writing to files with Perl Appending to files Open and read from text files Don't Open Files in the old way slurp mode - reading a file in one step Lists and Arrays Perl for loop explained with examples Perl Arrays Processing command line arguments - @ARGV in Perl How to process command line arguments in Perl using Getopt::Long Advanced usage http://perlmaven.com/stdout-stderr-and-redirection of Getopt::Long for accepting command line arguments Perl split - to cut up a string into pieces How to read a CSV file using Perl? join The year of 19100 Scalar and List context in Perl, the size of an array Reading from a file in scalar and list context STDIN in scalar and list context Sorting arrays in Perl Sorting mixed strings Unique values in an array in Perl Manipulating Perl arrays: shift, unshift, push, pop Reverse Polish Calculator in Perl using a stack Reverse an array, a string or a number The ternary operator in Perl qw - quote word Subroutines Subroutines and functions in Perl Variable number of parameters in Perl subroutines Understanding recursive subroutines - traversing a directory tree Hashes, arrays Hashes in Perl Creating a hash from an array in Perl Perl hash in scalar and list context How to sort a hash in Perl? Count the frequency of words in text using Perl Regular Expressions Introduction to Regexes in Perl 5 Regex character classes Regex: special character classes Perl 5 Regex Quantifiers trim - removing leading and trailing white spaces with Perl Perl and Shell related functionality How to remove, copy or rename a file with Perl Reading the content of a directory Traversing the filesystem - using a queue CPAN Download and install Perl How to change @INC to find Perl modules in non-standard locations How to add a relative d
4 – stdin, stdout, stderr Part 5 – If/Then Conditionals Part 6 – Loops Part 7 – Functions Part 8 – http://steve-jansen.github.io/guides/windows-batch-scripting/part-4-stdin-stdout-stderr.html Parsing Input Part 9 – Logging Part 10 – Advanced Tricks DOS, http://www.robvanderwoude.com/battech_redirection.php like Unix/Linux, uses the three universal “files” for keyboard input, printing text 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 standard error for display on the screen. Finally, the “Standard Err” file, known as stderr, contains any error messages for display on 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 standard error output 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 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
Challenges C# Getting Started Examples Development Software Books KiXtart Getting Started Examples Links Tools Books Perl Getting Started Examples Links Tools Books PowerShell Getting Started Examples Links Tools Books Regular Expressions Getting Started Expressions Examples Links Tools Books Rexx Getting Started Examples OS/2 LAN Server Links Tools Books VBScript & WSH Getting Started VBScript Techniques Examples HTA & WSC Examples Links Tools Books Challenges Technologies WMI Getting Started Examples Links Tools Books ADSI Getting Started Examples Links Tools Books Silent Installs General Windows Installer Specific Software Software Requirements Hardware Requirements Books Batch Files Windows Resource Kits KiXtart Perl PowerShell Regular Expressions Rexx VBScript & WSH C# WMI ADSI HTML, JavaScript & CSS Off-Topic Scripting Tools Batch Utilities Resource Kits Compilers Editors Code Generators Regular Expressions Automation Tools VBScript Add-Ons Visual Studio Printing Tools Inventory Tools Shell Extensions File Viewers Backup Security The making Of... Miscellaneous Tweaks Web Stuff Conversions My Photo Galleries About This Site Disclaimer News FAQ Search What's New Objective Site Policy Your Preferences Credits The Making Of... Contact Failed Mail Donate Batch How To ... Display & Redirect Output On this page I'll try to explain how redirection works. To illustrate my story there are some examples you can try for yourself. For an overview of redirection and piping, view my original redirection page. Display text To display a text on screen we have the ECHO command: ECHO Hello world This will show the following text on screen: Hello world When I say "on screen", I'm actually referring to the "DOS Prompt", "console" or "command window", or whatever other "alias" is used. Streams The output we see in this window may all look alike, but it can actually be the result of 3 different "streams" of text, 3 "processes" that each send their text to thee same window. Those of you familiar with one of the Unix/Linux shells probably know what these streams are: Standard Output Standard Error Console Standard Output is the stream where all, well, standard output of commands is being sent to. The ECHO command sends all its output to Standard Output. Standard Error is the stream where many (but not all) commands send their error messages. And some, not many, commands send their output to the screen bypassing Standard Output and Standard Error, they use the Console. By definition Console isn't a stream. There