Batch files if else condition

數值

IF %ERRORLEVEL% EQU 0 Echo No error found

 字串

if "%var% == "xxxx" (
    :: do something
) ELSE (
    :: do something
)

Reference :
If - Conditionaly perform command | SS64.com
More Powerful Batch Files- Branching with \"If\" statements
windows - Batch files, vista x64, if and parenthesis - Stack Overflow