Dos Script Error Handling
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Dos Batch Error Handling
up Batch Files - Error Handling up vote 34 down vote favorite 2 I'm currently writing my first batch file for deploying an asp.net solution. I've been Googling a bit for a general error handling approach and can't find anything really useful. Basically if any thing goes wrong I want to stop and print out what went wrong. Can anyone give me any dos script errorlevel pointers? batch-file share|improve this question edited Apr 29 '14 at 11:28 John Saunders 138k20175321 asked Jul 22 '09 at 9:15 bplus 2,87494574 add a comment| 5 Answers 5 active oldest votes up vote 34 down vote I generally find the conditional command concatenation operators much more convenient than ERRORLEVEL. yourCommand && ( echo yourCommand was successful ) || ( echo yourCommand failed ) There is one complication you should be aware of. The error branch will fire if the last command in the success branch raises an error. yourCommand && ( someCommandThatMayFail ) || ( echo This will fire if yourCommand or someCommandThatMayFail raises an error ) The fix is to insert a harmless command that is guaranteed to succeed at the end of the success branch. I like to use (call ), which does nothing except set the ERRORLEVEL to 0. There is a corollary (call) that does nothing except set the ERRORLEVEL to 1. yourCommand && ( someCommandThatMayFail (call ) ) || ( echo This can only fire if yourCommand raises an error ) See Foolproof way to check for nonzero (error) return code
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Try Catch Batch File
How do I add simple error handling to the script in a .cmd file? For example, if
Return Error Code From Batch File
I have: RENAME C:\MyDir\MyFile.txt MyFilexxx.txt And I get an error like "The system cannot find the file specified.", how do prevent it from executing the rest of the script http://stackoverflow.com/questions/1164049/batch-files-error-handling in the cmd file and instead exit (somewhat) gracefully?Thanks,-Dave Friday, August 21, 2009 12:57 AM Reply | Quote Answers 0 Sign in to vote RENAME C:\MyDir\MyFile.txt MyFilexxx.txt IF NOT %ERRORLEVEL% == 0 GOTO END REM here goes the rest of the script :END Marked as answer by dgolds Friday, August 21, 2009 3:34 PM Friday, August 21, 2009 https://social.technet.microsoft.com/Forums/scriptcenter/en-US/eca202a4-c8f3-40b6-a8b4-f4dad9682d55/add-simple-error-handling-to-cmd-file?forum=ITCG 5:53 AM Reply | Quote Microsoft is conducting an online survey to understand your opinion of the Technet Web site. If you choose to participate, the online survey will be presented to you when you leave the Technet Web site.Would you like to participate? Privacy statement © 2016 Microsoft. All rights reserved.Newsletter|Contact Us|Privacy Statement|Terms of Use|Trademarks|Site Feedback TechNet Products IT Resources Downloads Training Support Products Windows Windows Server System Center Browser Office Office 365 Exchange Server SQL Server SharePoint Products Skype for Business See all products » Resources Evaluation Center Learning Resources Microsoft Tech Companion App Microsoft Technical Communities Microsoft Virtual Academy Script Center Server and Tools Blogs TechNet Blogs TechNet Flash Newsletter TechNet Gallery TechNet Library TechNet Magazine TechNet Subscriptions TechNet Video TechNet Wiki Windows Sysinternals Virtual Labs Solutions Networking Cloud and Datacenter Security Virtualization Updates Service Packs Security Bulletins Windows Update Trials Windows Server 2012 R2 System Center 2012 R2 Microsoft SQL Server 2014 SP1 Windows 8.1 Enterprise See all trials » Related Sites Micro
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 http://steve-jansen.github.io/guides/windows-batch-scripting/part-3-return-codes.html the right 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 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 error handling of the last 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 script error handling error ) The ERRORLEVEL 1 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 s