Error Handling In Batch Programming
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Error Handling In Batch Script
Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a dos batch error handling community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up Batch Programming, Error Handling, and Start Command up vote 6 down vote favorite I am batch file error handling tutorial 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 command. So,
Batch File Error Handling Errorlevel
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 Batch files will be executed
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Programming Error Handling Best Practices
like you, helping each other. Join them; it only takes a minute: Sign up Error handling using ERRORLEVEL in Windows Batch Script up vote 0 down vote favorite We have some error handling setup in our scripts http://stackoverflow.com/questions/6498460/batch-programming-error-handling-and-start-command as shown: set ret = %ERRORLEVEL% if %ERRORLEVEL% == 0 GOTO PPCOK if not %ret% == 0 GOTO ERROR1 Someone else wrote the above, I however have a few concerns about it actually working properly. I have read that if you do a check for ERRORLEVEL = 0 it actually is checking if the errorlevel is 0 or higher. My assumption is that it would always go to the PPCOK label? Also, most examples http://stackoverflow.com/questions/21485988/error-handling-using-errorlevel-in-windows-batch-script on the web use "IF ERRORLEVEL 1" or some show "IF %ERRORLEVEL% EQU 1" and above uses "IF %ERRORLEVEL% == 0" I am wondering if there is a valid case for choosing which of these three methods should be used? On a side note I am not sure why they stored the errorlevel in another variable and used it on the second if statement rather than just doing another IF NOT %ERRORLEVEL% ... windows batch-file share|improve this question asked Jan 31 '14 at 17:11 Kairan 1,685143770 No, if %ERRORLEVEL% == 0 will only be true if the error level is actually zero. This method is usually preferable in my opinion, although it will fail in the pathological case where someone has created an environment variable named ERRORLEVEL. You are right in thinking that there is no need for the ret variable, in fact the second if statement is entirely redundant, you could just say GOTO ERROR1. –Harry Johnston Feb 4 '14 at 2:56 add a comment| 1 Answer 1 active oldest votes up vote 0 down vote accepted Batch is sensitive to spaces in a SET statement. SET FLAG = N sets a variable named "FLAGSpace" to a value of "SpaceN" IF ERRORLEVEL n is TRUE if errorlevel is n or greater than n. IF ERRORLEVEL 0 is therefore
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