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IF

Performs boolean operations in batch files. Performs
conditional processing in batch programs.

Syntax
      {help [command]|[command]/?}

File syntax
   IF [NOT] EXIST filename command 

   IF [NOT] EXIST filename (command) ELSE (command)

String syntax
   IF [/I] [NOT] item1==item2 command 

   IF [/I] item1 compare-op item2 command

   IF [/I] item1 compare-op item2 (command) ELSE (command)

Error Check Syntax
   IF [NOT] DEFINED variable command

   IF [NOT] ERRORLEVEL number command 

   IF CMDEXTVERSION number command

key
   item       : May be a text string or an environment
                variable a variable may be modified using
                either.
                Substring syntax or Search syntax.

   command    : The command to perform .

   NOT        : perform the command if the condition is
                false. 

   ==         : perform the command if the two strings are
                equal. 

   /I         : Do a case Insensitive string comparison.

   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 >=

                This 3 digit syntax is necessary because
                the > and < are recognised as redirection
                symbols.

When a program stops, it returns an exit code. You can use
exit codes as conditions by using the errorlevel parameter.

If the condition specified in an IF command is true, the
command that follows the condition is carried out. If the
condition is false, the command in the IF clause is ignored,
and executes any command in the ELSE clause, if one has been
specified.

You must use the ELSE clause on the same line as the command
after the IF.

You can improve the readability of a batch script by writing
a complex IF...ELSE command over several lines using
brackets.

To deliberately raise an ERRORLEVEL in a batch script use
the EXIT /B command.

Examples

The following example tests for the existence of a
directory:

if exist c:\mydir\nul goto proce

Cmd Commands