Codessentials

The Microsoft MS-DOS "IF ERRORLEVEL <number>" statement checks for error levels of the given number or greater. If you want to check for a specific error level, you should use the following command construct where <N> is the desired number. The <N+1> portion of the command must be calculated as the command is entered, because the MS-DOS command interpreter cannot perform mathematical calculations.

Examples

The following example executes command1 (whatever that may be) and if this command returns an exitcode 1 or greater then the dos script exits immediatly.
Only if command1 returns 0, the script continous and executes command2.

@echo off 
command1
if errorlevel 1 goto finally
command2
:finally
echo exit %errorlevel%
exit %errorlevel%

The following example executes command1 and if this command returns an exitcode 1 then the dos script exits immediatly.
If command1 returns 0 or a value greater than 1 the script continous and executes command2.

@echo off 
command1
if errorlevel 1 if not errorlevel 2 goto finally
command2
:finally
echo exit %errorlevel%
exit %errorlevel%