contains True if last operation succeeded and False otherwise. if you use Code: [Select]if errorlevel gtr 0 exit /b  anything over errorleve==1 would exit with exit code 1FB Logged Next time google it. IF ERRORLEVEL construction has one strange feature, that can be used to our advantage: it returns TRUE if the return code was equal to or higher than the specified 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 weblink
By default, the command processor will continue executing when an error is raised. In the case of an infinite loop, this EXIT /b behaviour will cause the script to hang until manually terminated with Ctrl + C Exiting nested FOR loops, if EXIT /b NEQ 0 (ECHO Attempt Failed) ELSE (ECHO Attempt succeeded!) GOTO :eof :Attempt SETLOCAL CALL somethingThatFails SET retcode=!errorlevel! Browse other questions tagged batch-file or ask your own question. http://stackoverflow.com/questions/20892882/set-errorlevel-in-windows-batch-file
Two tails in a row - what's the probability that the game started with a head? And, no, I'm not Steve Jansen the British jazz drummer, though that does sound like a sweet career. You have to code for halting on error.
in place of %var% to access the chnaged value of var or 2) to call a subroutine to perform further processing using the changed values. Mencken fireballsApprentice Code:TerminalThanked: 3 Re: How to return success/failure from a batch file? « Reply #5 on: September 09, 2008, 06:20:39 PM » Quote from: Sidewinder on September 09, 2008, 06:12:06 ECHO. Batch File Return Value Hot Network Questions Do Matrix Multiplication!
ECHO Check %%i exists, execute it if it does if exist .\ready\%%i ( call .\ready\%%i ECHO Move %%i to archive if no error occured if not errorlevel 1 ( copy .\ready\%%i Batch File Check Errorlevel Where the number 0 is your wanted errorlevel. But I'm digressing. http://steve-jansen.github.io/guides/windows-batch-scripting/part-3-return-codes.html It's a fallback step, in the same way that your neighbor is a fallback delivery location if you aren't home.
If quitting CMD.EXE, sets the process exit code with that number. [Brought to my attention by Maor Conforti. Batch File Exit Code 1 Why not just have an environment variable called %ERRORLEVEL% which is automatically updated to the error level whenever a command finishes running? It's just a variable whose name happens to coincide with a command processor concept. SomeCommand.exe || EXIT /B 1 A simliar technique uses the implicit GOTO label called :EOF (End-Of-File).
For example: Set ERRORLEVEL=1000 myprogram.exe Echo This is not the exit code: %ERRORLEVEL% Set ERRORLEVEL= myprogram.exe Echo This is the exit code: %ERRORLEVEL% Jay Bazuzi says: September 27, 2008 at 1:12 The kernel and the command processor operate at very different levels. -Raymond] Andrew from Vancouver says: September 26, 2008 at 6:59 pm Accessing %ERRORLEVEL% in a batch is useful to capture Set Errorlevel To 0 But there are many exceptions to this general rule. Batch File Exit Code says: September 26, 2008 at 12:19 pm Well, at least bash literally doesn't allow you to set the $?
Let me try to explain it in a different way:a.bat calls b.bat and when b.bat completes, a.bat continues with steps depending on whether b.bat succeeded or failed.a.bat:Code: [Select]rem some code here
have a peek at these guys However, it's possible that other errors can happen besides the file not existing (like if another process has a lock on the file) -- in both scenarios the file will not And I still hate it. EXIT without an ExitCode acts the same as goto:eof and will not alter the %ERRORLEVEL% You should never attempt to directly write to the %ERRORLEVEL% variable, (SET errorlevel...) instead use the Batch File Exit Command
That would be a neat trick. (I would guess the number of programs that would be broken by the change would be quite near zero.) [I would not be surprised if Any %var% within the block will be replaced by that variable's value AT THE TIME THE BLOCK IS PARSED - before the block is executed. So if you have two commands in the batch script and the first fails, the ERRORLEVEL will remain set even after the second command succeeds. check over here Logged To every complex question there is a simple answer and it is wrong…- H.L.
It is in form of boolean values, with 0 for success and 1 for failure. Batch File Set Exit Code windows command-line batch windows-error-reporting share|improve this question asked Sep 23 '13 at 18:42 user972276 2772513 add a comment| 2 Answers 2 active oldest votes up vote 7 down vote accepted You When ending a subroutine, you can use EXIT /b N to set a specific ERRORLEVEL N.
When you do this, the system will not use it until the command session is closed. greveszTopic StarterStarter How to return success/failure from a batch file? « on: September 09, 2008, 02:31:33 PM » Hello,I am new to the DOS world. Here is my batch script: REM Loop through each line of input.txt FOR /F "tokens=1-3 delims=, " %%i IN (./ready/input.txt) DO ( ECHO. Batch File Exit Code 0 Setting errorlevels MS-DOS & Windows 9x: Use ERRORLVL.EXE from OzWoz Software, or SETERLEV.COM 1.0 from Jim Elliott to test batch files that (are supposed to) check on errorlevels.
The same goes for other dynamic environment variables like CD (current directory), DATE (current date), TIME (current time), RANDOM (random decimal number between 0 and 32767), CMDEXTVERSION (current Command Processor Extensions ECHO Check %%i exists, set error flag if it doesnt if not exist .\ready\%%i set errorlevel=2 echo return code is %errorlevel% ECHO Run %%i if it exists if errorlevel 0 call Some utilities will return negative numbers as an exit code. http://objectdevcorp.com/batch-file/batch-file-if-errorlevel-else.html This will only work if the inner FOR loop is contained in a separate subroutine, EXIT /b terminates the subroutine.
This can make debugging a problem BAT script more difficult, a CMD batch script is more consistent and will set ERRORLEVEL after every command that you run [source]. I have written if errorlevel == 3 goto tag3 more times that i would like to.