Table 15-7. 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.)