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    Syntax - IF [NOT] condition command

    (Internal) Allows conditional execution of commands in batch file
    processing.

        NOT     executes the command only when the condition is FALSE.

        conditions are:

            ERRORLEVEL number    executes the command only if the program
                                 previously executed by COMMAND has an exit
                                 code of number or higher.

            string1 = = string2  executes the command only if string 1 and
                                 string 2 are identical after parameter
                                 substitution.

            EXIST filename       executes the command only if filename exists.

    Example:
            if exist pfspro.txt goto g