Dos Error Handling In Batch Files
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Exception Handling In Batch File
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Error Handling In Batch Script
am just starting to learn how to script. I'm trying to understand how the system handles Error Levels and how they can be used in error handling. I know there is a difference between the environment variable %ERRORLEVEL% and the Error Level of the system. If I understand this correctly, then the If ERRORLEVEL 1 code would check the environment variable before it checks the error level of the previous windows batch error handling command. So, in my program I am trying to interface a startup/stop script that will start/stop all scripts of a given machine (for testing I'm just using one application notepad.exe as an example). I have two wrapper scripts that will either start up or stop the applications by passing arguments to the independent script. If there is an error in the independent script, it will set the errorlevel using the EXIT /B n command. Once control is returned to the calling script, it will go to an error handling script if the exit status is non-zero. At first I was setting the %ERRORLEVEL% to zero manually and then testing for an error after a START or TASKKILL command. But then I read that clearing %ERRORLEVEL% with SET ERRORLEVEL= is a better method. My issue comes in when I try to start the app with START "" notepad.exe Whenever I test the errorlevel after this command it is always greater than or equal to 1 unless I use SET ERRORLEVEL=0 before I run the start command. I have inserted the code for the four scripts below. Any insight and advice would be greatly appreciated. appstart.bat: @echo off :: Script for application Start set ERRORLEVEL= :: **** :: Additional Ba
This Site Careers Other all forums Forum: General Computing DOS batch file error handling? Alan Wanwierd Ranch bat file error handling Hand Posts: 624 posted 8 years ago I'm writing a try catch batch file batch file to join together a bunch of processes triggered by batch files... When batch file errorlevel everything works its great, but my error handling sucks. I've tried using the %ERRORLEVEL% variable to crudely trap my errors, but my outer calling batch http://stackoverflow.com/questions/6498460/batch-programming-error-handling-and-start-command file never goes into error: call Batch1.bat if %ERRORLEVEL% NEQ 0 goto failed echo ...Completed Batch1, %ERRORLEVEL% call Batch2.bat if %ERRORLEVEL% NEQ 0 goto failed echo ...Completed Batch2, %ERRORLEVEL% Call Batch3.bat if %ERRORLEVEL% NEQ 0 goto failed echo ...Completed Batch3, %ERRORLEVEL% goto end :failed echo ....ERROR Please check logs https://coderanch.com/t/132733/gc/DOS-batch-file-error-handling for further details, %ERRORLEVEL% :end endlocal The output I end up with is: ...Completed Batch1, 0 .......BATCH2 ERRROR, Please check logs for details ...Completed Batch2, 0 ...Completed Batch3, 0 Obviously the Batch2.bat file is erroring - but the error is not being passed back. Is there a way around this? Post Reply Bookmark Topic Watch Topic New Topic Similar Threads how to redirect the tomcat (5.0) console output to a text file how to run mvn commands using ms bat file How to trap a java exception where java is invoked from a .bat file Setting up the Java Web Services tutorial and Sun Java system appn server Cruise control giving wrong status in email. All times are in JavaRanch time: GMT-6 in summer, GMT-7 in winter Contact Us | advertise | mobile view | Powered by JForum | Copyright © 1998-2016 Paul Wheaton
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 http://armillz.blogspot.com/2011/10/common-dos-batch-file-error-handling.html 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 http://www.computerhope.com/forum/index.php?topic=20664.0 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: error handling 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 handling in batch 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) ►
activation email? 1 Hour 1 Day 1 Week 1 Month Forever Login with username, password and session length Forum only search News: Home Help Login Register Computer Hope » Other » FAQ solutions database » Software » MS-DOS » Making batch files foolproof « previous next » Print Pages: [1] Go Down Author Topic: Making batch files foolproof (Read 19085 times) 0 Members and 1 Guest are viewing this topic. DilbertTopic Starter ModeratorEgghead Welcome to ComputerHope!Thanked: 43 Making batch files foolproof « on: April 20, 2006, 12:15:54 AM » QuestionI want to distribute my batch file. How can I make sure users don't mess up my batch file?AnswerIt's a fact of life that if it is possible for some knucklehead to mess it up, he/she will. There are three main methods of making sure it doesn't get botched up: 1) Explain how it works before the user uses it, 2) make a help section of the batch, and 3) add protection code to ensure that the user cannot screw up.1. Create a readme fileInclude a readme to go with your batch file, explaining the syntax, its uses and limitations. This, however, is the least reliable method, as very few people actually read it, no matter how much you tell them to read it. However, some might, and anyone that reads your readme will benefit (assuming good info is in the readme and that it's easy to understand).2. Create a help section in your batch fileIt's as easy as creating a label and liberally using the ECHO command. You could make it so that the user would trigger the help section if they made a syntax error. This section would have ideally the same info as the readme. This is more likely to be seen; however, there will still be a chance of a logic error that will slip through even the best of syntax error catchers.3. Write code to catch errors in the usage of the batch fileThough you should include at least #2