Capture Dos Error Output
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Started Expressions Examples Links Tools Books Rexx Getting Started Examples OS/2 LAN Server Links Tools Books VBScript batch capture output & WSH Getting Started VBScript Techniques Examples HTA & WSC Examples Links Tools Books Challenges Technologies WMI Getting Started Examples Links Tools Books ADSI Getting Started https://support.microsoft.com/en-us/kb/110930 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 http://www.robvanderwoude.com/battech_redirection.php 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
4 – stdin, stdout, stderr Part 5 – If/Then Conditionals Part 6 – Loops Part 7 – Functions http://steve-jansen.github.io/guides/windows-batch-scripting/part-4-stdin-stdout-stderr.html Part 8 – Parsing Input Part 9 – Logging Part 10 – Advanced Tricks DOS, 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 error output used to write output 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, capture error output 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 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