EXIST filename

True if filename exists; false otherwise.

Example:

IF EXIST temp DELETE temp

Deletes the file temp if it exists.

ERRORLEVEL number

True if current error level is equal to number.

Example:

IF ERRORLEVEL 0 GOTO label

"string1" == "string2"

True if the strings match. Strings can contain a variable, such as %SNUSER%, which is expanded before testing for a match. Strings can also contain a literal % by having two %% in a literal--the first % escapes the second %.

Exampl:e

IF "%SNUSER%" == "root" EXIT

If the user is root, then exit.