Dos Error Level 1
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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 dos batch error level 1 ECHO error level is 1 or more
Dos Error Code 1
succeeds if the error level is n or more. This was presumably because there were programs that expressed different degrees dos error 5 of 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 dos error 64 terrible 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
Dos Error 4
level. rem 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 o
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Dos Error Handling
a minute: Sign up using errorlevel in a batch file to know if a program exited normally up vote 4 down vote favorite 1 We have a program that is occasionally crashing. The customer runs the program from a scheduled https://blogs.msdn.microsoft.com/oldnewthing/20080926-00/?p=20743 task. When the program is run with a certain parameter, the program runs as an interface engine, creating a file and then ftp'ing the file to another server for import by another program. I was wondering if I might have the scheduled task instead run a batch file. The batch file would run the program and check errorlevel as the program exits. If errorlevel is not equal to zero, then batch file would run the program again. Does anyone see problem with http://stackoverflow.com/questions/13150676/using-errorlevel-in-a-batch-file-to-know-if-a-program-exited-normally my plan to use errorlevel in a batch file? Here's an example of the batch file: :start myPgm.exe intfc if errorlevel <> 0 then start batch-file share|improve this question edited Mar 21 at 10:42 BartoszKP 22.3k84067 asked Oct 31 '12 at 3:01 user1787319 23113 add a comment| 2 Answers 2 active oldest votes up vote 4 down vote accepted I would write it like so: :start myPgm.exe intfc IF %errorlevel% NEQ 0 GOTO :error GOTO :end :error echo There was an error. EXIT 1 :end echo End. EXIT 0 share|improve this answer edited Feb 28 '14 at 23:23 answered Jun 12 '13 at 22:10 djangofan 11.6k32109186 Your note is OK, but your code would give a syntax error. –dbenham Feb 27 '14 at 15:38 Ok, I changed my code. –djangofan Feb 28 '14 at 22:39 No, you misunderstood. You need either if %errorlevel% neq 0 ... or if errorlevel 1 .... The last form assumes the errorlevel is never negative. Your code is neither and raises a syntax error. –dbenham Feb 28 '14 at 23:09 ok, I understand. –djangofan Mar 1 '14 at 1:53 add a comment| up vote 3 down vote Your IF statement is wrong. It should read if %errorlevel% neq 0 goto start Or your script could read :start myPgm.exe intfc || goto start share|improve this answer answered Oct 31 '12 at 3:45 dbenham 77.9k11114179 Thanks for that feedb
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 http://steve-jansen.github.io/guides/windows-batch-scripting/part-3-return-codes.html return codes as the right way to communicate the outcome of your script’s execution http://www.computerhope.com/forum/index.php?topic=91064.0 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 dos error 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% NEQ 0 ( REM do something here to address the error ) Another common technique is: IF dos error 5 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 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 conven
activation email? 1 Hour 1 Day 1 Week 1 Month Forever Login with username, password and session length Forum only search News: Home Help Login Register Computer Hope » Microsoft » Microsoft DOS » DOS IF %ERRORLEVEL% construct « previous next » Print Pages: [1] Go Down Author Topic: DOS IF %ERRORLEVEL% construct (Read 73795 times) 0 Members and 1 Guest are viewing this topic. tale103108 Guest DOS IF %ERRORLEVEL% construct « on: September 02, 2009, 07:40:26 AM » Ok, I need to test the successful execution of a program within a DOS batch file, print if program fails but continue if program succeeds.Pseudo-code;program.exe # program that is executed and status to be checkedIF %ERRORLEVEL NEQ 0 ECHO "I failed" EXIT # check statusotherwise continue with batch job....Need code example because DOS is driving me crazy ... should be simple but I am using myprogram.exe@IF %ERRORLEVEL% NEQ 1 GOTO ERROR@IF %ERRORLEVEL% EQ 0 GOTO OK:ERRORECHO "Program failed, please check this log file for errors ..." GOTO END:OKmynestprogram.exe:ENDand it is not working-------------------------------------------------------------------------------- Logged billrich Guest Re: DOS IF %ERRORLEVEL% construct « Reply #1 on: September 02, 2009, 08:26:18 AM » C:\>type err.batCode: [Select]@echo off
rem myprogram.exe 0
set errorlevel=%1
echo errorlevel = %errorlevel%
IF %errorlevel% EQU 1 GOTO ERROR
IF %errorlevel% EQU 0 GOTO OK
:ERROR
ECHO "Program failed, please check this log file for errors ..."
GOTO END
:OK
echo mynestprogram.exe
:ENDOutput:C:\>err.bat 0errorlevel = 0mynestprogram.exeC:\>err.bat 1errorlevel = 1"Program failed, please check this log file for errors ..."C:\> Logged billrich Guest Re: DOS IF %ERRORLEVEL% construct « Reply #2 on: September 02, 2009, 08:37:20 AM » if /?where compare-op may be one of: EQU - equal NEQ - not equal LSS - less than LEQ - less than or equal GTR - greater than GEQ - greater than or equal Logged Salmon TroutGeniusThanked: 838 Computer: Specs Experience: Experienced OS: Other Re: DOS IF %ERRORLEVEL% construct « R