Dos Error Level Examples
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Chen - MSFTSeptember 26, 200815 0 0 0 The command interpreter cmd.exe has a concept known as the error level, which is the exit code of the program most recently run. You can test the error level with the IF ERRORLEVEL command: IF ERRORLEVEL 1
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ECHO error level is 1 or more
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failure with higher and higher exit codes. For example, the diff program has three exit codes: 0 means the files are the same; 1 means the files are different; 2 means that something terrible dos error code 1 happened. 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 wish, create an environment variable with the name ERRORLEVEL, in the same way that you can create an environment variable called FRED. But, as with FRED, that variable won't have any effect on the error level. rem dos error 53 this next command sets the error level to zero CMD /C EXIT 0 set ERRORLEVEL=1 if ERRORLEVEL 1 echo Does this print? The message is not printed because the ERRORLEVEL environment variable has no effect on the error level. It's just a variable whose name happens to coincide with a command processor concept. set BANKBALANCE=$1,000,000.00 "Hey, when I tried to withdraw the money, I got an insufficient funds error. What am I doing wrong?" Now, it does happen to be the case that if command extensions are enabled and you say %ERRORLEVEL%, then the command processor first looks for an environment variable called ERRORLEVEL, and if it can't find one, then it replaces %ERRORLEVEL% with the current value of the internal error level value. It's a fallback step, in the same way that your neighbor is a fallback delivery location if you aren't home. If you file a change-of-address form for yourself, that doesn't affect packages sent to your neighbor. The same behavior can be seen with %CD%: If you did not explicitly set an environment variable called CD, then %CD% expands to the command processor's current directory. But you can't change directories by saying set CD=C:\Windows. I can think of a few r
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Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 million programmers, just like you, helping https://blogs.msdn.microsoft.com/oldnewthing/20080926-00/?p=20743 each other. 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 file conditionally upon another exe executing successfully. I've tried a few different combinations of IF and ERRORLEVEL but none seem to work "..\..\..\TeamBuildTypes\Current Branch\DatabaseUpdate.exe" -s http://stackoverflow.com/questions/6812484/batch-file-test-error-level localhost\sql2008r2 IF %ERRORLEVEL% 1( "..\..\..\TeamBuildTypes\Current Branch\DatabaseUpdate.exe" -s localhost\sql2008 ) Pause Gives me the error 1( was unexpected at this time. Where am I going wrong here? error-handling batch-file share|improve this question asked Jul 25 '11 at 6:32 Daniel Powell 4,96734079 Hmm, perhaps 1( is wrong? Have you tried 1 ( with a space? And by the way use either if errorlevel 1 (... or if %errorlevel%==1 (... –jeb Jul 25 '11 at 6:44 @jeb: That seems to be the actual cause of the error, I mean, the mixed up syntax in the OP's script. –Andriy M Jul 25 '11 at 22:49 add a comment| 2 Answers 2 active oldest votes up vote 17 down vote accepted IF ERRORLEVEL is a special syntax supported since the DOS days, the %ERRORLEVEL% variable support was added in WinNT. The original syntax is used like this: call someapp.exe if errorlevel 1 goto handleerror1orhigher if errorlevel 0 echo succuess... To use the variable, use the normal IF syntax: if %errorlevel%==0 echo suc
stdin, stdout, stderr Part 5 – If/Then Conditionals Part 6 – Loops Part 7 – Functions Part 8 – Parsing Input http://steve-jansen.github.io/guides/windows-batch-scripting/part-3-return-codes.html Part 9 – Logging Part 10 – Advanced Tricks Today we’ll cover return codes as the right way to communicate the outcome of your script’s execution to the world. Sadly, http://www.easydos.com/if.html 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 dos error 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 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 dos error 5 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 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
(command) [parameters] IF [NOT] ERRORLEVEL (number) (command) [parameters] Purpose: Allows for conditional operations in batch processing. Discussion When used in combination with the GOTO command, the IF command provides a way to transfer control within a batch file dependent on the outcome of a test. For more information on IF and other batch commands, see Chapter 5, Using Batch Files, in the downloadable book DOS the Easy Way . The IF test is indicated by the condition label in the command format. It can be one of three types: Condition 1: IF [NOT] EXIST (filename) (command) This condition is determined by a test to see if a file exists (or does not exist) on disk. When this conditional test is included (it can be on any line of your batch file), DOS checks to determine if the specified file exists (you must specify the path so DOS can find the file). If the condition is true (as stated), the specified command is executed. If the condition is found to be false, the command is not acted on and processing proceeds to the next line in the batch file. When the IF command is used together with the GOTO command, it provides a way to transfer control to a different line in the batch file dependent on the outcome of the test. For example, to display a warning message only if the file DATA.1 does not exist in the current directory, enter echo off if not exist data.1 goto MESSAGE echo The file DATA.1 exists on the current directory goto END MESSAGE echo The file DATA.1 was not found. echo The file must be in the current directory :END When you enter the name of this batch file, there are two possible outcomes. If the file DOES NOT EXIST in the current directory, the program will display: echo off The file DATA.1 was not found. The file must be on the current directory If the file DOES EXIST in the current directory, the program will display: echo off echo The file DATA.1 exists on the current directory. In this example, the IF command is combined with the GOTO command to determine the optional branching. The command tells DOS to check the current disk to determine if the file DATA.1 exists. Since we are using the NOT EXIST form of the command, the condition is true if it DOES NOT find the file; since the condition is true, the specified command (in this case, the GOTO command) is acted on. The GOTO MESSAGE line passes processing to the :MESSAGE label and the messages on the following lines are displayed. Condition 2: IF [NOT] string