Ms Dos Command Error
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Join the Stack Overflow Community Stack Overflow is a community of 6.2 million programmers, just like you, helping each other. Join them; it only dos error codes list takes a minute: Sign up How to exit a batch program upon error? up vote 5 down vote favorite I've got a batch file that does several things. If one of them fails, I want to exit the whole program. For https://support.microsoft.com/en-us/kb/110930 example: @echo off type foo.txt 2>> error.txt >> success.txt mkdir bob If the file foo.txt isn't found then I want the stderr message appended to the error.txt file, else the contents of foo.txt is appended to success.txt. Basically, if the type command returns a stderr then I want the batch file to exit and not create a new directory. How can you tell if an error occurred and decide if you need to continue to the next command or not? ms-dos http://stackoverflow.com/questions/3303575/how-to-exit-a-batch-program-upon-error stderr share|improve this question asked Jul 21 '10 at 20:33 Notorious2tall 93041125 I added the code IF NOT ERRORLEVEL 0 EXIT /B echo %errorlevel% before the mkdir bob command, but regardless of the value of ERRORLEVEL (i.e. 0 or 1) the directory is still created. So basically, ERRORLEVEL is being set with a different value whether the type command finds the file or not, but the program is not exiting. Thoughts? –Notorious2tall Jul 21 '10 at 21:07 add a comment| 1 Answer 1 active oldest votes up vote 10 down vote use ERRORLEVEL to check the exit code of the previous command: if ERRORLEVEL 1 exit /b EDIT: documentation says "condition is true if the exit code of the last command is EQUAL or GREATER than X" (you can check this with if /?). aside from this, you could also check if the file exists with if exist foo.txt echo yada yada to execute multple commands if the condition is true: if ERRORLEVEL 1 ( echo error in previous command & exit /b ) or if ERRORLEVEL 1 ( echo error in previous command exit /b ) share|improve this answer edited Apr 2 '14 at 16:26 danio 4,04642043 answered Jul 21 '10 at 20:39 akira 4,7901828 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using Google Sign up using Facebook Sign up using Email and Password Post as a
stdin, stdout, stderr Part 5 – If/Then Conditionals Part 6 – Loops Part 7 – Functions Part 8 – Parsing Input Part 9 – Logging Part 10 – Advanced Tricks Today we’ll cover return codes as the right http://steve-jansen.github.io/guides/windows-batch-scripting/part-3-return-codes.html way to communicate the outcome of your script’s execution to the world. Sadly, even skilled Windows programmers overlook the importance of return codes. Return Code Conventions By convention, command line execution should return zero when execution succeeds and non-zero http://www.robvanderwoude.com/battech_redirection.php when execution fails. Warning messages typically don’t effect the return code. What matters is did the script work or not? Checking Return Codes In Your Script Commands The environmental variable %ERRORLEVEL% contains the return code of the last ms dos executed program or script. A very helpful feature is the built-in DOS commands like ECHO, IF, and SET will preserve the existing value of %ERRORLEVEL%. The conventional technique to check for a non-zero return code using the NEQ (Not-Equal-To) operator of the IF command: IF %ERRORLEVEL% NEQ 0 ( REM do something here to address the error ) Another common technique is: IF ERRORLEVEL 1 ( REM do something here to address the error ) The ERRORLEVEL 1 redirect stderr to statement is true when the return code is any number equal to or greater than 1. However, I don’t use this technique because programs can return negative numbers as well as positive numbers. Most programs rarely document every possible return code, so I’d rather explicity check for non-zero with the NEQ 0 style than assuming return codes will be 1 or greater on error. You may also want to check for specific error codes. For example, you can test that an executable program or script is in your PATH by simply calling the program and checking for return code 9009. SomeFile.exe IF %ERRORLEVEL% EQU 9009 ( ECHO error - SomeFile.exe not found in your PATH ) It’s hard to know this stuff upfront – I generally just use trial and error to figure out the best way to check the return code of the program or script I’m calling. Remember, this is duct tape programming. It isn’t always pretty, but, it gets the job done. Conditional Execution Using the Return Code There’s a super cool shorthand you can use to execute a second command based on the success or failure of a command. The first program/script must conform to the convention of returning 0 on success and non-0 on failure for this to work. To execute a follow-on command after sucess, we use the && operator: SomeCommand.exe && ECHO SomeCommand.exe succeeded!
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