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# Logical Operators

表格 15-6. Logical Operators

Example | Name | Result
--- | --- | ---
$a and $b | And | `TRUE` if both $a and $b are `TRUE`.
$a or $b | Or | `TRUE` if either $a or $b is `TRUE`.
$a xor $b | Xor | `TRUE` if either $a or $b is `TRUE`, but not both.
! $a | Not | `TRUE` if $a is not `TRUE`.
$a && $b | And | `TRUE` if both $a and $b are `TRUE`.
$a || $b | Or | `TRUE` if either $a or $b is `TRUE`.

The reason for the two different variations of "and" and "or" operators is that they operate at different precedences. (See Operator Precedence.)

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