If Command Extensions are enabled IF changes as follows: IF /I string1 compare-op string2 command IF CMDEXTVERSION number ...

If Command Extensions are enabled IF changes as follows:

    IF [/I] string1 compare-op string2 command
    IF CMDEXTVERSION number command
    IF DEFINED variable command

where compare-op may be one of:

    EQU - equal
    NEQ - not equal
    LSS - less than
    LEQ - less than or equal
    GTR - greater than
    GEQ - greater than or equal

and the /I switch, if specified, says to do case insensitive string
compares.  The /I switch can also be used on the string1==string2 form
of IF.  These comparisons are generic, in that if both string1 and
string2 are both comprised of all numeric digits, then the strings are
converted to numbers and a numeric comparison is performed.

The CMDEXTVERSION conditional works just like ERRORLEVEL, except it is
comparing against an internal version number associated with the Command
Extensions.  The first version is 1.  It will be incremented by one when
significant enhancements are added to the Command Extensions.
CMDEXTVERSION conditional is never true when Command Extensions are
disabled.

The DEFINED conditional works just like EXIST except it takes an
environment variable name and returns true if the environment variable
is defined.

If Command Extensions are enabled CHDIR changes as follows: The current directory string is converted to use the same case ... If Command Extensions are enabled DEL and ERASE change as follows: The display semantics of the /S switch are reversed in ... If Command Extensions are enabled ENDLOCAL changes as follows: If the corresponding SETLOCAL enable or disabled command extensions ... If Command Extensions are enabled GOTO changes as follows: GOTO command now accepts a target label of :EOF which transfers ... If Command Extensions are enabled IF changes as follows: IF /I string1 compare-op string2 command IF CMDEXTVERSION number ... If Command Extensions are enabled MKDIR changes as follows: MKDIR creates any intermediate directories in the path, if needed. ... If Command Extensions are enabled SET changes as follows: SET command invoked with just a variable name, no equal sign or ... If Command Extensions are enabled SETLOCAL changes as follows: SETLOCAL batch command now accepts optional arguments: ENABLEEXTENSIONS ... If Command Extensions are enabled the DATE command supports the /T switch which tells the command to just output the current ...