Command Line Error Level
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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 ECHO error level is
Cmd.exe Errorlevel
1 or more
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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 this next command sets the error level to zero CMD /C EXIT
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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 reasons why this feature may have been added. So you can include the error level in a log file: ECHO error level is %ERRORLEVEL%>logfile
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Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow is a community of 4.7 command prompt error could not find or load main class million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How do I get the application exit code from a Windows command line? up vote 466 down vote favorite 95 https://blogs.msdn.microsoft.com/oldnewthing/20080926-00/?p=20743 I am running a program and want to see what its return code is (since it returns different codes based on different errors). I know in Bash I can do this by running echo $? What do I do when using cmd.exe on Windows? windows command-line process cmd exit-code share|improve this question asked Dec 2 '08 at 18:04 Skrud 3,56831622 5 Also asked on SuperUser: How to check the exit code of http://stackoverflow.com/questions/334879/how-do-i-get-the-application-exit-code-from-a-windows-command-line the last command in batch file? –Deanna Jun 24 '13 at 11:42 add a comment| 6 Answers 6 active oldest votes up vote 573 down vote accepted A pseudo environment variable named errorlevel stores the exit code: echo Exit Code is %errorlevel% Also, the if command has a special syntax: if errorlevel See if /? for details. Example @echo off my_nify_exe.exe if errorlevel 1 ( echo Failure Reason Given is %errorlevel% exit /b %errorlevel% ) Warning: If you set an environment variable name errorlevel, %errorlevel% will return that value and not the exit code. Use (set errorlevel=) to clear the environment variable, allowing access to the true value of errorlevel via the %errorlevel% environment variable. share|improve this answer edited Aug 9 at 16:11 Dave Jarvis 16.4k24105204 answered Dec 2 '08 at 18:07 Samuel Renkert 6,81821626 17 If you're running directly from a Windows command line and always seeing 0 returned, see Gary's answer: stackoverflow.com/a/11476681/31629 –Ken Aug 30 '12 at 13:51 1 Also if you're in powershell you can use echo Exit Code is $LastExitCode –Brandon Pugh Jan 16 '14 at 19:47 4 Note: "errorlevel 1" is true if errorlevel >= 1. So "errorlevel 0" will match everything. See "if /?". Instead, you can use "if %ERRORLEVEL% EQU 0 (..)". –Curtis Yallop Jul 29 '1
stdin, stdout, stderr Part 5 – If/Then Conditionals Part 6 – Loops Part 7 – Functions Part http://steve-jansen.github.io/guides/windows-batch-scripting/part-3-return-codes.html 8 – Parsing Input Part 9 – Logging Part 10 – http://superuser.com/questions/194662/how-to-check-the-exit-code-of-the-last-command-in-batch-file 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, even skilled Windows programmers overlook the importance of return codes. Return Code Conventions By convention, command line execution should return zero when execution command line 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 of the last executed program or script. A very helpful feature is the built-in DOS commands like ECHO, IF, command prompt error 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 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 err
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Super User Questions Tags Users Badges Unanswered Ask Question _ Super User is a question and answer site for computer enthusiasts and power users. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the top How to check the exit code of the last command in batch file? up vote 54 down vote favorite 5 Inside a batch file on Windows, I use 7-zip like this: ...\right_path\7z a output_file_name.zip file_to_be_compressed How could I check the exit code of 7z and take the appropriate action ? windows-xp batch share|improve this question asked Oct 1 '10 at 4:47 Misha Moroshko 1,64361628 1 Also asked on Stackoverflow: How do I get the application exit code from a Windows command line? –Deanna Jun 24 '13 at 11:42 add a comment| 2 Answers 2 active oldest votes up vote 62 down vote accepted Test for a return code greater than or equal to 1: if ERRORLEVEL 1 echo Error or if %ERRORLEVEL% GEQ 1 echo Error or test for a return code equal to 0: if %ERRORLEVEL% EQU 0 echo OK You can use other commands such as GOTO where I show echo. share|improve this answer edited Oct 1 '10 at 5:27 answered Oct 1 '10 at 4:58 Dennis Williamson 57.5k10101136 I tried your code. I got the following error: 0 was unexpected this time. –Misha Moroshko Oct 1 '10 at 5:13 2 @Misha: You may have tried it with the percent signs the way I originally posted it. Try it without them or try the other versions I added. –Dennis Williamson Oct 1 '10 at 5:24 Great, thanks a lot !! –Misha Moroshko Oct 1 '10 at 11:53 2 Found cases where %ERRORLEVEL% is 0 even though an error occurred. Happened when checking %ERRORLEVEL% in a cmd file. Trying start /wait didn't work. The only thing that worked is if errorlevel 1 (...) –AlikElzin-kilaka Apr 13 '15 at 12:59 3 Be aware, errorlevel is not an environment variable. Here's a good summary of the pitfalls and subtleties. –Nick Westgate Jun 17 '15 at 6:18 | show 1 more comment up vote 6 down vot