What is batch Errorlevel?
The environmental variable %ERRORLEVEL% contains the return code of the last executed program or script.
What does errorlevel 1 mean?
In Microsoft Windows and MS-DOS, an errorlevel is the integer number returned by a child process when it terminates. Errorlevel is 0 if the process was successful. Errorlevel is 1 or greater if the process encountered an error.
Does ECHO change Errorlevel?
Yes, echo something has absolutely no effect on the error level and will not change errorlevel to 0 as that will just always succeed. For example: running a echo something > c:\somefile. txt , which will succeed actually creating the file, but not change errorlevel to 0.
How do I stop a Windows batch script?
EXIT /B at the end of the batch file will stop execution of a batch file. use EXIT /B < exitcodes > at the end of the batch file to return custom return codes.
How do you end a batch script?
Close the current batch script, exit the current subroutine or close the CMD. EXE session, optionally setting an errorlevel. Syntax EXIT [/B] [exitCode] Key /B When used in a batch script, this option will exit only the script (or subroutine) but not CMD.
How do I test Errorlevel?
- The errorlevel is made available via IF ERRORLEVEL or the %ERRORLEVEL% variable.
- IF ERRORLEVEL n statements should be read as IF Errorlevel >= number.
- A preferred method of checking Errorlevels is to use the %ERRORLEVEL% variable:
- IF %ERRORLEVEL% NEQ 0 Echo An error was found.
How do I remove Errorlevel?
Set or Force an exit code
- To force an ERRORLEVEL of 1 to be set without exiting, run a small but invalid command like COLOR 00 or run (CALL) which does nothing other than set the ERRORLEVEL to 1.
- To clear the ERRORLEVEL back to 0, run (call ), which does nothing except set the ERRORLEVEL to 0.
Is it safe to set errorlevel in batch?
This blog entry by Batcheero explains perfectly why you should never SET the ERRORLEVEL variable. The safest way to use errorlevels for all DOS versions is the reverse order check. This will result in many more lines of batch code, but at least it will work in any DOS version.
What’s the difference between errorlevel 0 and 1?
Most programmers agree that an errorlevel 0 means the command executed successfully, and an errorlevel 1 or higher usually spells trouble. But there are many exceptions to this general rule.
Which is the safest way to use errorlevels?
The safest way to use errorlevels for all DOS versions is the reverse order check. This will result in many more lines of batch code, but at least it will work in any DOS version. In Windows NT (Windows NT 4
How to set the errorlevel in cmd.exe?
Quits the CMD.EXE program (command interpreter) or the current batch script. Specifies a numeric number. If /B is specified, sets ERRORLEVEL that number. If quitting CMD.EXE, sets the process exit code with that number.