ERRORLEVEL and%errorlevel%

Their function is to judge the return value of the last command.

By default, the return value of one command is only 2, 0 indicates success, and 1 indicates failure.

But there are exceptions, some command return values will be greater than 2, the return value can be any number between 0~255

if ERRORLEVEL Echo Right

When the return value is >=0, the output right

if %errorlevelecho right2

When the return value is =0, the output right2

The If%errorllevel% comparison method does not only use the = = number, but can also be controlled using the following parameters:

EQU: Equals

NEQ: Not equal to

LEQ: Less than or equal to

LES: Less than

GTR: Greater Than

GEQ: greater than or equal to

ERRORLEVEL and%errorlevel%