Command Line Batch Error Handling
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Command Line Batch File If Statement
I make a batch file terminate upon encountering an error? up vote 178 down vote favorite 39 I have a batch file that's calling the same executable over and over with different parameters. How do I make it terminate immediately if one of the calls returns an error code of any level? Basically, I want the equivalent of MSBuild's ContinueOnError=false. batch-file share|improve this question command line batch file arguments edited Sep 19 '14 at 10:13 Nakilon 19.5k86186 asked Apr 9 '09 at 14:56 Josh Kodroff 10.1k2172125 1 What command shell will be running your script? DOS/Win9x's command.com or Win2k+'s cmd.exe? Since that makes a world of difference, could you please clarify that in an edit of your question? –Mihai Limbășan Apr 9 '09 at 14:58 add a comment| 6 Answers 6 active oldest votes up vote 182 down vote accepted Check the errorlevel in an if statement, and then exit /b (exit the batch file only, not the entire cmd.exe process) for values other than 0. same-executable-over-and-over.exe /with different "parameters" if %errorlevel% neq 0 exit /b %errorlevel% If you want the value of the errorlevel to propagate outside of your batch file if %errorlevel% neq 0 exit /b %errorlevel% but if this is inside a for it gets a bit tricky. You'll need something more like: setlocal enabledelayedexpansion for %%f in (C:\Windows\*) do ( same-executable-over-and-over.exe /with different "parameters" if !errorlevel! neq 0 exit /b !errorlevel! ) Edit: You have to check the error after each command. There's no global "on error goto" type of construct in cmd.exe/command.com batch. I've
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Command Line Batch File Examples
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Command Line Batch File Variables
them; it only takes a minute: Sign up Does Windows batch support exception handling? up vote 13 down vote favorite 7 Does Windows batch programming support exception handling? If not, is there any way to effectively emulate exception handling http://stackoverflow.com/questions/734598/how-do-i-make-a-batch-file-terminate-upon-encountering-an-error within batch files? I would like to be able to "throw an exception" anywhere within a batch script, at any CALL level, and have the CALL stack popped repeatedly until it finds an active "TRY block", whereupon a "CATCH block" can handle the exception fully and carry on, or do some cleanup and continue popping the CALL stack. If the exception is never handled, then batch processing is terminated and control returns to the command line context with an http://stackoverflow.com/questions/31445330/does-windows-batch-support-exception-handling error message. There are already couple posted ways to terminate batch processing at any CALL depth, but none of those techniques allow for any structured cleanup activity that would normally be provided within other languages via exception handling. Note: This is a case where I already know a good answer that has only recently been discovered, and I want to share the info batch-file exception exception-handling cmd share|improve this question asked Jul 16 '15 at 4:24 dbenham 77.8k11114179 add a comment| 2 Answers 2 active oldest votes up vote 14 down vote accepted Windows batch scripting certainly does not have any formal exception handling - hardly surprising considering how primitive the language is. Never in my wildest dreams did I ever think effective exception handling could be hacked up. But then some amazing discoveries were made on a Russian site concerning the behavior of an erroneous GOTO statement (I have no idea what is said, I can't read Russian). An English summary was posted at DosTips, and the behavior was further investigated. It turns out that (GOTO) 2>NUL behaves almost identically to EXIT /B, except concatenated commands within an already parsed block of code are still executed after the effective return, within the context of the CALLer! Here is a short example that demonstrates most of the salient points. @echo off setlocal enableDelayedExpansion set "var=Parent Value" ( call :test echo This and the fol
Checking and Running as Scheduled Tasks ★★★★★★★★★★★★★★★ Paul Adams (ex-MSFT)June 6, 201016 0 0 0 Batch files may be considered “old hat” by a lot of people (or a complete mystery to the younger ones!) but they are sometimes still the easiest way to https://blogs.technet.microsoft.com/mrsnrub/2010/06/06/batch-files-basic-error-checking-and-running-as-scheduled-tasks/ execute simple jobs as they have practically no requirements other than a command shell process to run within – yes there is a strong probability that a script could achieve an identical (or at least equivalent) result, but the fact is http://armillz.blogspot.com/2011/10/common-dos-batch-file-error-handling.html that it will be more complex and therefore longer to create and administer. Something that trips up a fair number of people is the difference between double-clicking a .BAT file and scheduling it as a task to run at a command line certain time, on a trigger or on a schedule – it can seem that the batch file just simply does not run at all, and the return code sent back to the Task Scheduler is often 0x2, “path not found”, even though the file most definitely is there. When you double-click a .BAT or .CMD file through Explorer, a cmd.exe process is started to provide the environment in which it will run. The credentials used are your own (or more correctly, command line batch inherited from the Explorer process). The “current working directory” is set to that where the batch file lives. When the Task Scheduler service starts the same batch file it actually invokes an instance of cmd.exe (as SYSTEM impersonating the user whose credentials are defined in the task) to carry out the process and waits for it to exit with a return code – the current working directory for this process is not that of the batch file, but that of cmd.exe itself. i.e. %windir%\system32 Now, if your batch file assumes that you launched it through Explorer or from an existing command prompt with the current working directory set to its own location, you can run into problems. One simple way to verify if your batch file should work as a scheduled task is to call it from an existing cmd.exe process from a different current working directory (such as your profile, or a temp folder). Be very, very careful if your batch file does any kind of file deletion – especially if wildcards are involved – you do not want to be in the wrong context when doing this (especially not a system folder or your profile!). The trick is to do some basic error checking at the start and throughout your batch files, and possibly even some rudimentary logging by piping messages to a file. One simple solution is to have the batch file set the current working directo
don't make any sense. I'm sure they made perfect sense to me at the time. ;-) Wednesday, October 5, 2011 Common DOS batch file error handling mistakes I make I write a decent amount of batch scripts now days to automate things on windows server boxes. Unfortunately, I don't do it quite frequently enough to remember all the crazy syntax of DOS commands. One of these errors is error handling. These are the things I commonly need to deal with. I found this page (and site) very helpful for all DOS related stuff: http://www.robvanderwoude.com/errorlevel.php Use "IF %ERRORLEVEL% NEQ 0 SET MYERROR=1" to record whether the previous command resulted in an error code. Alternately, you can check for "IF ERRORLEVEL 1 ..." if you want to look for a specific error level. Be cautious of manipulations with ERRORLEVEL. It's not really an environment variable like other variables. In particular, do NOT ever use "set ERRORLEVEL=5" or similar. It will corrupt any further use of %ERRORLEVEL% syntax by fixing it at a value. Use "CALL FOO.BAT" instead of just "FOO.BAT" when calling subscripts. Otherwise, when that script completes it will not return to the current script. Use "EXIT /B 1" to return an exit code from your script. If you use "EXIT 1" it will exit the entire command shell, including closing your current window if it's running in one. Consider using SETLOCAL and ENDLOCAL within your script to prevent temporary environment variables from carrying through to outer shells. Below is an example script. :: Sample script with some error handling SETLOCAL SET MYPARAM=%1 if "%MYPARAM%"=="" goto :USAGE CALL .\childscript.bat %MYPARAM% if %ERRORLEVEL% NEQ 0 set MYERROR=1 echo. echo Finished child script. Handling errors now... if %MYERROR%==1 GOTO :ERROR echo It worked! ENDLOCAL set SOME_EXTERNAL_VARIABLE=1 GOTO :EOF :USAGE echo Please provide a command line parameter. EXIT /B 2 :ERROR echo It didn't work, dude. EXIT /B 1 Update: I was wrong about the ERRORLEVEL syntax earlier, so I updated after some testing. Posted by Richard Mills at 10:01 AM Labels: DOS, windows No comments: Post a Comment Newer Post Older Post Home Subscribe to: Post Comments (Atom) Followers Blog Archive ► 2013 (1) ► November (1) ► 2012 (9) ► November (1) ► October (2) ► September (1) ► July (1) ► June (3) ► January (1) ▼ 2011 (17) ► December (1) ► November (1) ▼ October (4) Repairing