Conditional structures: Difference between revisions

=={{header|Batch File}}==

IF syntax:

<lang dos>

IF [NOT] ERRORLEVEL number command

IF [NOT] string1==string2 command

IF [NOT] EXIST filename command

IF CMDEXTVERSION number command

IF DEFINED variable command

IF [/I] string1 compare-op string2 command

where compare-op is:

EQU - equal

NEQ - not equal

LSS - less than

LEQ - less than or equal

GTR - greater than

GEQ - greater than or equal

/I case insensitive string compares

</lang>

The ELSE clause must be on the same line as the command after the IF.

For example:

<lang dos>

IF EXIST %filename% (

del %filename%

) ELSE (

echo %filename% not found

)

</lang>