Dos Exit Code Error
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stdin, stdout, stderr Part 5 – If/Then Conditionals Part 6 – Loops Part 7 – Functions Part 8 – Parsing Input Part 9 – Logging Part 10 dos exit code 1 – Advanced Tricks Today we’ll cover return codes as the right way to
Dos Exit Code 255
communicate the outcome of your script’s execution to the world. Sadly, even skilled Windows programmers overlook the importance of return codes. dos batch exit code 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 unix exit code 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 technique to check for a non-zero return code using the NEQ (Not-Equal-To) operator of the IF command: IF %ERRORLEVEL%
Windows Exit Code
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 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
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Batch Exit Code 4
» Print Pages: [1] Go Down Author Topic: How to return success/failure from a batch file? (Read 126750 times) 0 Members and 1 Guest are viewing http://steve-jansen.github.io/guides/windows-batch-scripting/part-3-return-codes.html this topic. greveszTopic StarterStarter How to return success/failure from a batch file? « on: September 09, 2008, 02:31:33 PM » Hello,I am new to the DOS world. Could someone please help with these questions:How do I return 0 for success ate the end of an MSDOS batch file?Similarly, how do I return 1 http://www.computerhope.com/forum/index.php?topic=65815.0 (or other values) representing erroneous execution?Thanks in advance!Gabor Logged diablo416Hopeful Re: How to return success/failure from a batch file? « Reply #1 on: September 09, 2008, 03:25:36 PM » heres an example@echo offsetlocal enabledelayedexpansionping 127.0.0.1 if "%errorlevel%"=="0" cls &Echo Success.if "%errorlevel%"=="1" cls &Echo Failendlocal Logged greveszTopic StarterStarter Re: How to return success/failure from a batch file? « Reply #2 on: September 09, 2008, 04:20:08 PM » Thanks, but that's not exactly what I had in mind. Let me try to explain it in a different way:a.bat calls b.bat and when b.bat completes, a.bat continues with steps depending on whether b.bat succeeded or failed.a.bat:Code: [Select]rem some code here
call b.bat
if "%errorlevel%=="0" goto success
:failure
rem do something
goto end
:success
rem do something else
:endWhat would b.bat look like for a.bat to work?Thanks again!Gabor Logged fireballsApprentice Code:TerminalThanked: 3 Re: How to return success/failure from a batch file? « Reply #3 on: September 09, 2008, 04:23
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 http://stackoverflow.com/questions/14905876/how-to-return-an-error-code-without-closing-the-command-prompt-window about Stack Overflow the company Business Learn more about hiring developers or posting ads with us Stack Overflow Questions Jobs Documentation Tags Users Badges Ask Question x Dismiss Join the Stack Overflow Community Stack Overflow http://www.chebucto.ns.ca/~ak621/DOS/ExitCode.html is a community of 4.7 million programmers, just like you, helping each other. Join them; it only takes a minute: Sign up How to return an error code without closing the Command Prompt window? exit code up vote 11 down vote favorite 2 I am writing a batch file which validates a couple of files. When one of the file isn't valid, I want the batch script to stop and return an error code >0. The code below seem to do the job, but calling "EXIT 2" closes the Command Prompt window in which the script was running. :Validate SETLOCAL Validator %1 IF %ERRORLEVEL% GEQ dos exit code 1 EXIT 2 ENDLOCAL Any idea on how to return an error code without closing the Command Prompt? windows batch-file dos command-prompt share|improve this question asked Feb 16 '13 at 1:15 Martin 11.5k38135216 To return anything, it has to finish... –vonbrand Feb 16 '13 at 1:43 add a comment| 3 Answers 3 active oldest votes up vote 25 down vote accepted To get help for command prompt commands use their /? option. Exit /? shows: Quits the CMD.EXE program (command interpreter) or the current batch script. EXIT [/B] [exitCode] /B specifies to exit the current batch script instead of CMD.EXE. If executed from outside a batch script, it will quit CMD.EXE exitCode specifies a numeric number. if /B is specified, sets ERRORLEVEL that number. If quitting CMD.EXE, sets the process exit code with that number. So you want IF %ERRORLEVEL% GEQ 1 EXIT /B 2 share|improve this answer answered Feb 16 '13 at 1:28 Hans Passant 653k819571601 add a comment| up vote 1 down vote You can use the pause command before calling exit. If you don't like the message: pause > nul share|improve this answer answered Feb 16 '13 at 1:19 Pascal Belloncle 7,23112542 I just tried and now I have
task. Batch file decisions may be made based on what code was generated. This webpage gives a short discussion of these codes and ways in which they might be used. Deep detail will not be gone into. If you want to know more, see your DOS manual and/or the On-Screen Help. Be aware that not everything presented here may work as shown for the commands included with the version or manufacturer of DOS you have. INFORMATION BELOW MAY NOT BE REPRODUCED WITHOUT PERMISSION FROM THE AUTHOR © What are Exit Codes? When DOS or its software finishes a command operation, it usually generates a code upon exiting. When it gives that exit code, it is essentially saying: Here are the results of my work. Since these are generated after a command has finished and exited, they are known as "Exit Codes". These codes are hidden from the user but may be tested for via various methods. The codes give the computer system an idea of what happened during an operation or after it has completed. One code might signal that the task ended with no errors, or that it ended with no errors but that the operation was not successful. If an error did occur, a code might be generated depending on what the error was. Why Might I Want to Use Exit Codes? Since these codes can indicate what happened during a computer operation, they can be used in a batch file to tailor the direction of further procedures. So as an example, if one used the "FC" (File Compare) command and the outcome was that two files matched, a further procedure could be that the batch file be directed to delete one of the duplicate files. Another example of this is given farther on. (See this website's Batch File Tutorial for information on writing batch files.) What do Exit Codes Look Like? Each is one of 256 available values represented by a number from 0 (zero) through 255. `0' typically represents an operation that was completed with no errors. Other numbers might represent problems or various results. Note that not all available numbers will typically be used by a program. In fact, I know of only a few commands or