asked 3 years ago viewed 13733 times active 6 months ago Linked 1 Restart a crashed exe? Certain commands, such as for, goto, and if, enable you to do conditional processing of the commands in the batch file. ECHO Check %%i exists, set error flag if it doesnt if exist .\ready\%%i (set "errorflag=") ELSE (set errorflag=2) CALL echo return code is %%errorflag%% ECHO Run %%i if it exists if How to increase the population growth of the human race How to map and sum a list fast? http://gatoisland.com/batch-file/bat-file-error-level.php
CALL ECHO %%errorlevel%% displays, but sadly then RESETS errorlevel. Trout.You have answered all of tale103108's questions.Too bad tale103108 does not provide any feedback.Are you a Guru for batch files? Join them; it only takes a minute: Sign up batch file test error level up vote 4 down vote favorite 2 I'm trying to conditionally run an exe from a batch The IF command will interpret brackets around a condition as just another character to compare (like # or @) for example: IF (%_var1%==(demo Echo the variable _var1 contains the text demo
neq 0 (echo error level is non-zero) ) But sometimes you don't want delayed expansion enabled. This is an important difference because if you compare numbers as strings it can lead to unexpected results: "2" will be greater than "19" and "026" will be greater than "26". File syntax IF [NOT] EXIST filename command IF [NOT] EXIST filename (command) ELSE (command) String syntax IF [/I] [NOT] item1==item2 command IF [/I] item1 compare-op item2 command IF [/I] item1 compare-op
It's just a variable whose name happens to coincide with a command processor concept. Examples: IF EXIST C:\logs\*.log (Echo Log file exists) IF EXIST C:\logs\install.log (Echo Complete) ELSE (Echo failed) IF DEFINED _department ECHO Got the _department variable IF DEFINED _commission SET /A _salary=%_salary% + SomeCommand.exe || GOTO :EOF Tips and Tricks for Return Codes I recommend sticking to zero for success and return codes that are positive values for DOS batch files. Errorlevel Vs %errorlevel% Windows 2000 and later: In Windows 2000 & XP a new /B switch has been added to the EXIT command, enabling the batch file to quit with a return code: EXIT
To execute a follow-on command after sucess, we use the && operator: SomeCommand.exe && ECHO SomeCommand.exe succeeded! Batch If Errorlevel Not 0 There are also programs that use an exit code of zero to mean success and anything else to mean failure. In addition to this internal state, you can, if you Most programmers agree that an errorlevel 0 means the command executed successfully, and an errorlevel 1 or higher usually spells trouble. Maybe cmd.exe builtin set could set its exit value to the value passed in instead of setting the environment variable when the variable being set in is named ERRORLEVEL?
You figured it out. Batch Errorlevel Not Equal 0 The Exit Codes can be detected directly with redirection operators (Success/Failure ignoring the ERRORLEVEL) Some commands don't follow the rules Commands that do NOT affect the ERRORLEVEL: BREAK, ECHO, ENDLOCAL, FOR, 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 If you attempt to execute a non-existent command %ERRORLEVEL% = 9009 Detecting Errors In the CMD shell the exit code is made available via the %ERRORLEVEL% variable or via IF ERRORLEVEL
Miscellaneous Tweaks Web Stuff Conversions My Photo Galleries About This Site Disclaimer News FAQ Search What's New Objective Site Policy Your Preferences Credits The Making Of... Checking Return Codes In Your Script Commands The environmental variable %ERRORLEVEL% contains the return code of the last executed program or script. Errorlevel In Batch File There seem to be issues within IF statements and such, so then delayedexpansion is encouraged, but it seems to come with quirks of its own. Batch File Set Errorlevel Verbs of buttons on websites Yes, of course I'm an adult!
Using Map to convert Feet + Inches to Inches in a List of Lists On THE other hand or on another hand? http://gatoisland.com/batch-file/batch-file-return-error-level.php Or use CHOICE.COM, available in all DOS6.* and up versions, to set an errorlevel: ECHO 5 | CHOICE /C:1234567890 /N and ECHO E | CHOICE /C:ABCDEFGHIJ /N will both result in Related 195What does %~d0 mean in a Windows batch file?471Windows batch files: .bat vs .cmd?131How do you loop through each line in a text file using a windows batch file?232Hidden features What you can't do is set the error level via "set ERRORLEVEL=…". Batch Errorlevel Handling
Hi, I'm Steve. What type of sequences are escape sequences starting with "\033]" GTIN validation Natural construction Is this safe to display MySQL query error in webpage if something went wrong? Symbolic comparison of recursive functions When taking passengers, what should I do to prepare them? navigate here page last uploaded: 2016-09-19, 14:57 /* steve jansen */ // another day in paradise hacking code and more Windows Batch Scripting: Return Codes Mar 1st, 2013 | Comments Overview Part 1
set /? Errorlevel Codes If /B is specified, sets ERRORLEVEL that number. When ending a subroutine, you can use EXIT /b N to set a specific ERRORLEVEL N.
atoi(argv) : 0; } … and then call it from batch? billrich Guest Re: DOS IF %ERRORLEVEL% construct « Reply #7 on: September 02, 2009, 10:05:41 AM » This is what Mr. That is why I first explicitly define an ERRORLEVEL variable before I attempt to clear it! Batch File Return Code 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.
ERRORLEVEL is a special varable name. I thought my ponderous prose style and choleric disposition would give me away to all, but it seems I have been lucky. IF ERRORLEVEL 1 will return TRUE when the ERRORLEVEL is greater than or equal to 1 IF NOT ERRORLEVEL 1 means if ERRORLEVEL is less than 1 (Zero or negative). http://gatoisland.com/batch-file/batch-file-change-error-level.php it's amazing, I would have thought everyone would have figured out his secret by now...Guess it's limited to a small subset, eh Salmon Logged I was trying to dereference Null Pointers
Warning messages typically don’t effect the return code.